They need more variation between special infected in the game, such as Tank's different hair colour/style. Just a thought. Coinciding with that is the name tag: it would be very limiting. How many people who work in chlorine plants are going to be named 'Bill'?
Also, not relevant to this, in game they should have more of a backstory; sort of flesh out each of their stories more. Like, if you're doing single player, you play your chosen characters single player mode. Even on online, before you play multiplayer each could be doing their own backstory, then slowly meet the others. How they found out, how they got their weapons, how they survived, how they met up. Things like that.
mixmasterteapot
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