Calling it "slight" is being generous. Lots of competitive games have almost GTA-level aim assist. There's nothing inherently wrong with that but it does rub me the wrong way when the controller and keyboard players can end up in the same lobbies, as mouse aiming and controllers aim assists usually play very differently and thus rewards different skills.

I could also probably yap for a while about why I think these differences killed the "old" movement shooters (e.g Quake) and gave rise to CoD's style of movement shooter