Probably one of the best games ever made.
Its replayability is quite unmatched, even when large games like Left 4 Dead promised unlimited replayability with the director.. Killing Floor trumps that on pure gameplay alone.

Simple, violent and intense

Very VERY short campaign, (3 hours).. however it was pretty engaging.

This game was more like an expansion pack for COD Modern warfare seeing as though the gameplay, controls and graphics were pretty identical, and even though was set around 2020.. you really cant tell its any different from modern era.

I dont intend on playing the Multiplayer, sooo cant review there, but if you see this game on special (50% or more off in the store) buy it, i dont think it deserves much more money for how short it is.

Buy if --- You enjoyed COD and have time and cash to spare

Nah, they tried to be like every other FPS game on the market these days.. the sniping bit is (funnily enough) the only good part.
However you find yourself either sneaking around targets or using your pistol more than the rifle.

I.. Dont really recommend.. if you expect a sniper simulation game, stay away.