I have to say, there's this really old game (back from the 2000s) that I played a whole lot of called Serious Sam. First person shooter game, loads of enemies, some amount of replayability? I say that because the enemies do spawn in the same locations every time you play, to me it's just fun to see how quickly I can beat a section or a level.
Ark Survival for now as it’s a fun game to grind and make new friends in, I’m waiting for Rust to come out on the PS4, if it does, and I’ll probably prefer that over Ark.