I enjoy infected far more than human but I manage with either side.
There are a huge number of bugs and exploits that need to get patched out of the game, though. Valve needs to get its stuff together... This is the first time they've released an unfinished product and I sincerely hope it is the last. I want more versus campaigns, less overpowering autoshotgun spam, less corner and closet bunching, and a more resilient smoker tongue. If I can have those things, coupled perhaps with a stamina bar for melee to prevent the massive weapon-switch-plus-melee spam I'd be quite happy.