One of the best zombie waves-coop games out there. Had a blast back in the days with KF1 and KF2 just improved on the basis of the first one. The only downside compared to the first title is the lack of a darker and grimmier atmosphere, more like a survival horror setting.
Killing Floor 2 has a deep class customization, an extensive variety of weapons to try out and a quite fair learning curve movement and positioning wise. This is a must try if you like first person shooters, coop and zombie waves games. Looking forward to see what Tripwire will do with Killing Floor 3.

it is a direct upgrade to the first game. there are more classes, characters, guns, maps, and has a banger soundtrack. the voice acting is much better in this one than in the first. the only thing i dislike is that the gunshots sound a little less powerful but its really not something to be upset about.

While I have an unhealthy attraction to this game thanks to the capability of running modded maps, it's not the best. Late-game there isn't much to grind for apart from fancy skins and camos and an icon. Plus the enemy variety gets tired quick too. If there's a sale it's worth it, otherwise save your pennies and wait for the third installment.