GTA IV: I've played this about 18 months ago and hated it. I played it again a few weeks ago and hate it even more. This is a terrible terrible game. I could write pages on why I hate this game if I had the time.
More Fun To Compute said:
Going by review scores it has to be GTA4. The reviews of this game were farcical and resulted in a lot of us taking game reviews as seriously as a flower in a clown's lapel.
Seconded
Halo (series): Like many people I just don't see much appeal in it. I've played the multiplayer and I just don't think it's that good. It's just an ok game.
Super Smash Brothers Brawl: I like this game but this was hyped way too much and doesn't really deserve an amazing score due to so many flaws and dreadful online. One day I was bored and wrote a flaw list for this game. Seriously. I still have it.
Prince of Persia (The recent one): I got this game because I wanted to try out the series. The game is an overflowing bowl of shit and I don't say that lightly. It's just a bunch of repetitive platforming in which you fight enemies with the worst combat I've ever played in a game and then collect a bunch of stupid orbs. There are no rewards, poor writing, no skill to be used and has no immersion. The only thing that could be said that is good about this game are the graphics. If you ask me, this game does not deserve any score higher than 15/100.
New Super Mario Brothers: I wasn't interested in this game when I heard of it but I borrowed it from my old room mate a while back. It was bad. I can't imagine the Wii version being any better or different.
Any sports games like FIFA and NHL: Not only these games are downright crap and repetitive, but you could also play sports without the use of a videogames console. Plus you also get fit and it's a hell of a lot more rewarding and fun.
There are many other games but either I can't be bothered to list them but I also can't think of them atm.