I've never been an FPS fan, so I'm kinda confused at how people still keep buying them, playing them and raving about them. Surely there's a limit to the amount of fun you can have with such a limited genre.
As far as music games go, I'm happy as long as they keep releasing new songs. Whether it's as full games or DLC packs, I don't care. It'd be nice if they'd stop dicking around with new game mechanics, particularly when they're only adding them because they feel they have to rather than because they're needed or wanted, but that's possibly just me.
Really, the thing that endlessly confuses me is the entire sports genre, but particularly things like FIFA, Madden, etc. I've had a few FIFA games over the years, and the only appreciable difference between one game and the next is lineup changes, particularly so now that we're at the point where graphics can't really get much better. Since I'm reasonably sure that lineup changes and such could be added via patch or DLC, releasing a whole new game every year seems massively redundant.