Iffy fun.
Now, from the get go, I'm going to give this game the benefit of the doubt, since the computer I played it on had to have the graphics at the absolute lowest to play, and even then it was slow. But... even with that aside, the game felt very... slow, very laggy. And with a ping of 37 I often found myself freezing or jumping all over the place. I have tremendous fun with the game, but only when I can find a server of people who actually use team work. It's unbelievable how many times I get told to shove off in a game where you're supposed to be working together. What's worse is I'm almost always a medic, so it confuses me as to why you would want to leave me, or anyone else on your team, behind. While this ins't the games fault, it is a fault in the game, so i feel it's fair to mention it. Also, the end boss could have.. you know, been different once in a while? Maybe give some maps difference bosses perhaps? It's boring to fight the same hulking beast with the same weaknesses every time.
Killing Floor gets a 3.5 for decent graphics, even on the lowest settings, and game-play that can hold it's self together, but the team work aspect needs to be more... forceful. There needs to be a way to punish those that don't play along.