First off why bring the game back if nothing has changed?(If there was any I didn't notice). So I have suggestions and complaints again for Infected and some of these are from a post I previously made that I didn't really give any attention to.

Maps: The maps are pretty crap. There exploitable, unfair advantages for either side (not a big deal really depending on player count).
Suggestions: Don't build maps bassed off of texture packs because players probably don't have it or won't download it. Make maps that are practical to the games subject like the map "City" and not maps like Candyland. DON'T USE BARRIER BLOCKS (THEIR SO ANNOYING). If your gonna make a functional map you don't need barrier blocks. If player intentionally walks off or if there not paying attention and walk off into the void just make the void kill them. Also if you need barrier blocks to keep people from exploiting the map THEN MAKE A MAP THAT CAN'T BE EXPLOITED(little salty there I know). If new maps with exploits that are found the map should be removed and remade.

Kits: Shouldn't be that hard to make. I mean as long as they function to there purpose there fine but I think they should be edited more including human ones other then just ranked ones that are so unfair and people use that as an advantage to grind kills (Like a certain someone I see all the time infected doing). I there should be about 5-11 kits for infected and humans. I'ma list off on what I think they should look like.
Infected Kits:
Zombie: Rotten flesh thing with sharp 1 or whatever is fine already.
Endermen: Generates an enderpearl every 15 seconds or so.
Skeleton: Bow with 32 arrows.
Spider: A spider eye with a chance to deal poison effects at some percentage around 5%.
Witch: Slowness or weakness potions (About 2-3 each) with the ability to spawn in bat 2 bat minions that deal 1/2 damage but they have 2 hearts of health. This kit should cost coins.
Creeper: Should be able to shoot a tnt block every 30-45 seconds and also a suicide attack that will instantly kill anyone with in a 5x5 radius. This kit should cost coins.
Blaze: Double jump ability and a wood sword with 10 hits left of fire aspect. This kit should cost coins or be an achievement kit.

Human Kits: 1 Health potion for each kit
Standard: Leather armor, Stone sword.
Archer: Leather Armor (no helmet), Bow /w 64 arrows.
Barbarian: Diamond Chestplate, Iron sword, slowness 1
Sorcerer: No Armor, 1 Swiftness I potion 3:00, 3 Instant Damage I potions, Fire resistance 1:30, Regeneration I 0:45, Stick with Knockback II (This kit should have some form of potions with about 6-13 potions in total not of each kind). This kit should also cost coins.
Bomber: Chain-mail Chestplate, 5 Tnt that's ignites the instant its thrown, Flint & Steel with Sharpness I. This kit should cost coins or be an achievement kit.

Ranks/Coins/EXP:
Honestly when you rank up the kits for humans are way to op and make it unfair against infected so removing the upgrades should necessary to have the kit system function. Ranks should also work for how much experience you've gained from certain tasks/goals. (This section has to be implemented correctly in order to work well).(EXP is the way to rank up.) The way the experience system should work is by you gain EXP by killing infected (1 EXP), Killing a Human (10-15 EXP depending on kit there using.), Achievements (EXP amount giving depending on each achievement which will be listed in that section.), Losing a game (5 EXP) & Winning a game (20 EXP). Coins should be given among Winning/Losing a game, Killing Humans/Infected & Completing achievements. 25 Coins should be given upon winning a game and 5 for losing. For killing an infected 1 Coin should be given and for killing a Human 5 Coins should be given. Coins should also be traded into meebles at a 1-1 ratio. (When you first join Infected you'll start of with 100 coins to buy 1 of the beginner 4 kits for infected). Rankups will be listed at the bottom of this post.

Community:
The community for Infected is crap at the moment for having people who grind the game (Still the same person I'm pointing fingers at), People who purposely use OP kits to make the game not fun for others. I think that completely remaking the game and changing the whole system should improve this.

Rules/Tutorials:
We need a tutorial added or better rules explaining the game. The tutorial should give basic information on how each kit works, how to play the game from each perspective and how the system works. The game should work by having 1/3 of the current players in each game as infected and giving the Humans 30 seconds to hide or setup somewhere. The infected goal is to kill all of the Humans before the time limit it up(6 Minutes).

Leaderboards:
I opposed this idea at first but now I think there should be a leaderboard for Coins, Rank, Human Kills, Infected Kills, Total Kills, Play time and Damage Dealt. These leaderboards should show the top 25 Players for each of these topics at spawn off to the side but visible from spawn.

Gamemodes:
I think there should 2 gamemodes for this game, Traditional Infected and Deathmatch.
Traditional Infected is where Humans have to outlast the Infected invasion by surviving in a large environment for 6 minutes.
Deathmatch Infected is where you are spawn into a large arena with small obstacles and Humans and Infected have to battle it out in this arena. All armor is disabled in this gamemode but all weapons are kept the same. The time limit can voted upon from 30seconds to 2minutes. In this gamemode the sides are split up to 1/2 of the players are Infected and the other half are Humans.

Donor Perks:
Most donor perks should be removed from this game (including multipliers) because they create an unfair advantage for non-Donor players.

Lottery/Spinner - Suggested by Paaliaq_XX
The lottery works by every 24 hours non-Donor players receive 1 ticket to put into a slot machine that gives anywhere from 1 - 100 coins. Donors get 1 extra ticket for the order from lowest to highest. Here is a list in case you don't understand. VIP - 2 Tickets, Premium - 3 Tickets, Exclusive - 4 Tickets, Elite - 5 Tickets, Supreme - 6 Tickets, Ultimate - 7 Tickets. In order to receive this ticket you must play 2 FULL games (doesn't matter if you won or lost). This is to ensure to keep the balance of the game.

Achievements: I think Achievements should be added to be able earn EXP and coins and also special Kits that can earn if you complete all of them. This is my list on what I think should be added (and it's a lot).
Play a game of Infected: 1EXP, 5 Coins
Win a game of Infected: 5EXP, 5 Coins
Loss a game of Infected: 5EXP, 5 Coins
First Kill: 1EXP, 1 Coins
First Death: 1EXP, 1 Coins
Kill 5 Infected: 1 EXP, 5 Coins
Kill 50 Infected: 5EXP, 10 Coins
Kill 500 Infected: 25EXP, 100 Coins
Kill 2500 Infected: 150EXP, 2,000 Coins
Kill 10000 Infected: 1,000EXP, 10,000 Coins
Kill 5 Humans: 5EXP, 15 Coins
Kill 50 Humans: 50EXP, 125 Coins
Kill 500 Humans: 250EXP, 1,000 Coins
Kill 2500 Humans: 1,000EXP, 7,500 Coins
Kill 10000 Humans: 75,000EXP, 50,000 Coins
Win 5 Games: 10EXP, 25 Coins
Win 50 Games: 100EXP, 150 Coins
Win 500 Games: 750EXP, 1,550 Coins
Win 2500 Games: 3,375EXP, 12,500 Coins
Win 10000 Games: 15,500EXP, 75,000 Coins
Buy all Infected kits: 100EXP, 500 Coins
Buy all Human kits: 100EXP, 500 Coins
Get to Rank 100(Total of 1,000,000EXP): 0EXP, 1,000,000 Coins
Get to Rank 75(Total of 100,000EXP): 0EXP, 100,000 Coins
Get to Rank 50(Total of 25,000EXP): 0EXP, 25,000 Coins
Get to Rank 25(Total of 5,000EXP): 0EXP, 5,000 Coins
(I have alot more that could be added but I wanted to keep this a little short.)

Rank List:
Rank 1: 1EXP Rank 26: 5,800EXP Rank 51: 28,000EXP Rank 76: 136,000EXP
Rank 2: 200EXP Rank 27: 6,600EXP Rank 52: 31,000EXP Rank 77: 172,000EXP
Rank 3: 400EXP Rank 28: 7,400EXP Rank 53: 34,000EXP Rank 78: 208,000EXP
Rank 4: 600EXP Rank 29: 8,200EXP Rank 54: 37,000EXP Rank 79: 244,000EXP
Rank 5: 800EXP Rank 30: 9,000EXP Rank 55: 40,000EXP Rank 80: 280,000EXP
Rank 6: 1,000EXP Rank 31: 9,800EXP Rank 56: 43,000EXP Rank 81: 316,000EXP
Rank 7: 1,200EXP Rank 32: 10,600EXP Rank 57: 46,000EXP Rank 82: 352,000EXP
Rank 8: 1,400EXP Rank 33: 11,400EXP Rank 58: 49,000EXP Rank 83: 388,000EXP
Rank 9: 1,600EXP Rank 34: 12,200EXP Rank 59: 52,000EXP Rank 84: 424,000EXP
Rank 10: 1,800EXP Rank 35: 13,000EXP Rank 60: 55,000EXP Rank 85: 460,000EXP
Rank 11: 2,000EXP Rank 36: 13,800EXP Rank 61: 58,000EXP Rank 86: 496,000EXP
Rank 12: 2,200EXP Rank 37: 14,600EXP Rank 62: 61,000EXP Rank 87: 532,000EXP
Rank 13: 2,400EXP Rank 38: 15,400EXP Rank 63: 64,000EXP Rank 88: 568,000EXP
Rank 14: 2,600EXP Rank 39: 16,200EXP Rank 64: 67,000EXP Rank 89: 604,000EXP
Rank 15: 2,800EXP Rank 40: 17,000EXP Rank 65: 70,000EXP Rank 90: 640,000EXP
Rank 16: 3,000EXP Rank 41: 17,800EXP Rank 66: 73,000EXP Rank 91: 676,000EXP
Rank 17: 3,200EXP Rank 42: 18,600EXP Rank 67: 76,000EXP Rank 92: 712,000EXP
Rank 18: 3,400EXP Rank 43: 19,400EXP Rank 68: 79,000EXP Rank 93: 748,000EXP
Rank 19: 3,600EXP Rank 44: 20,200EXP Rank 69: 82,000EXP Rank 94: 784,000EXP
Rank 20: 3,800EXP Rank 45: 21,000EXP Rank 70: 85,000EXP Rank 95: 820,000EXP
Rank 21: 4,000EXP Rank 46: 21,800EXP Rank 71: 88,000EXP Rank 96: 856,000EXP
Rank 22: 4,200EXP Rank 47: 22,600EXP Rank 72: 91,000EXP Rank 97: 892,000EXP
Rank 23: 4,400EXP Rank 48: 23,400EXP Rank 73: 94,000EXP Rank 98: 928,000EXP
Rank 24: 4, 750EXP Rank 49: 24,200EXP Rank 74: 97,000EXP Rank 99: 964,000EXP
Rank 25: 5,000EXP Rank 50: 25,000EXP Rank 75: 100,000EXP Rank 100: 1,000,000EXP
Rank GOD: 2,000,000EXP/All Achievements/All Kits/At least 10,000,000 Coins/Total of 500,000 Kills

Credit/People who helped me with idea's
IGN: Paaliaq_XX, creedgaming45