It is precisely that no proper motion blur is applied in the current games making 30 fps feel choppy. It would be very nice if 60 fps is CONSTANT, and yes I think it is very important to have a game in 60 fps.
It's like playing Assasin's Creed where during the loading white screen where you can run around in a white blank world, everything seems perfectly smooth, but then once you are in the loaded world, it is choppy as hell.
No_Intelligence's comments