Well for many reasons. I personally tried to like them, buy never understood the appeal. In RPGs there is a certain sense of development. Every time you play your character gets stronger and better, your decisions influence the game, there is usually great voice acting and so on. With strategy games you feel some kind of accomplishment and that you actually really use your brain to win. In racing games you get to drive faster than you ever could in real life and drive cars most of us do not afford.
I really hate it in fps games when some smartasses think it's so cool to just hide somewhere and kill everyone with a snipper (it happened to me one too many times in MAG). And the developing team puts much less effort to make another cod than most other genres (except sports games). Take FFXIII for example. It is such a huge game and it gets critisized for everything both from fans and critics. Same with GT5. COD:BO gets a 9, while GT5 AND XIII 8 (a mere 0,5 more than prologue, the freaking demo) and 8,5 respectively (at least from Gamespot). I juts really don't get how that much effort goes unnoticed.
