aiming a gun properly should feel sluggish compared to playing doom. These games arent aiming to be fps in that way
If you could get hold of a deactivated gun or whatever and hold it out to aim it, it is pretty heavy. Add in things like recoil especially on 30 cal and it should be harder to aim on auto definitely
Even a handgun is like holding a couple of bags of sugar at arms length, accuracy isnt a given
Personally I dislike how fps can be mostly about ping and how fast your frame rate is, thats a great game but cs showed how much gameplay can improve dramatically with greater considerations