First. Neither one of the games are bad.

This is all about preference in my opinion. Two games, two styles. I don't have to explain the styles. We know what these games are about. YOU have to find what fits for YOU. To be reliant on other peoples' opinions is just poor judgement. Yes, mw3 looks like mw2, but what else is it suppossed to look like? A Call of Duty franchise game is going to look like a Call of Duty franchise game.