It's drawing inspiration from a few big FPS releases but then many games do this. The important part is that this game is implementing those inspirations excellently.
I've played about 5 hours so far not much because of real life stuff. But I can say it's one of the best games I've played in recent years probably longer.
If you don't mind my asking, what's your staple diet, with regards to games? (What sort of games are you into)