The obvious answer: CoD. Partly because I find the games to be a little buggy in the mulitplayer (which is supposedly the best part of the games), mostly because the people who like it praise it as if it were a god and insult and bash me if I stopped playing it for at least a week.
The not so obvious answer: Dragon Age. For some reason everyonne I know who has played the game loves it, but I just couldn't get into it. Also, since Demons Souls came out at around the same time, I found myself putting more time into that than anything else, but even when I took a break from Demons Souls I still found Dragon Age to be boring.
The semi-obvious answer: Metal Gear Solid 4. I enjoy the series as a whole, and while the story in 4 wasn't bad, the amount of story to gameplay in this one made me feel that they should of made it in to a TV series instead of a game. Everywhere I looked though people seemed to think that the game was godly, while I was barely able to find amusment (of the interactive kind anyway) within it.