the new COD is bugged so that's not a good reference point. But Bad company 2 would play well on your system probably also @1080p resolution.
most lcds run at 60 hz. Ok some new ones support 120 hz for 3d but that's just a gimmick.
Human eye is pretty limited. That's why moves @24hz look like movies and not slideshows, a fly on the other hand would perceive it as slideshow. That's why the are nto so easy to catch.

And 100 FPS or 300 FPS makes 0 difference.