I'll go with COD also, I used to play cod4 all that time ago for like two months straight, then I got bored and every game since has just felt exactly the same.
I guess another thing would be final fantasy, although I can't claim to have played any of them besides 13 (and admittedly graphically that is absolutely stunning) I found it poo.

Games I love that everyone hates/doesn't play or even know about: Warhawk. Still having fun to this day with that despite its age.