KF is a fun zombie slaughter, but some balance issue is keeping that from happening.
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I can't say KF is very innovative, since she ain't the first FPS features killing hordes of zombie like creatures, or a perk and level system.
But a multiplayer game massive enough to allow up to 100 players playing in one server? That's something that didn't exist since the Tribal2 or Joint Operation.
It's real fun to play in a server with more than 20 players. You really gets drawn into the feeling of zombie movies where bunch of survivors working together fending of zombie hordes.
But it's a bit ridiculous when players squeeze into the shop in the "shopping time" between each wave of mobs.
Also, the damage you need to do in order to level up your perk after Lv2 is kinda too much. Which means you need a LOT of grinding for that.
Some would say there's already custom maps which allows grinding easier. But what I'm talking about is the balance of the leveling stuff: when you play you need a higher level to have fun, but if leveling up requires too much grinding, then that's ruining the fun.
Aside from the leveling part, there're minor bugs which cause the mobs to stuck together, and boss creatures to stand still and spinning rather than chasing player.
But like what I've said at the beginning, KF is a pretty decent game. And with hope, the developer will fix the minor bugs and that balance issue in near future.
So if you're into killing zombies, Killing Floor is a game that worths playing.