Killing Floor 2 is still all about surviving wave after wave of zombie (ZED) attack.
This can take you a few hours so until then the perks do kind of feel a little samey, but that is not meant as a major criticism of the game. You see you cannot actually unlock your special skills for a perk until you are level 5. I feel that there is a lot of diversity to the classes, but it can take a while to get there. Killing Floor 2 has ten different ones for you to choose from these range from a field medic who is fast and all about healing the team to a demolitions expert that can use C4 to blow stuff up. These are basically the classes that you get to play as. Killing Floor 2 brings back the perks from the first game.