Dragon Age was pretty meh, but then I never got the feeling that it was overrated. GTA: San Andreas, yes expansive, huge, bikes, cheeseburgers, but damn was it ugly, the early game gang wars only served to highlight how crappy the combat in the GTA3 line really was.
Now I gotta say a few words to all the Valve haters. Portal isn't the second coming, but it was charming, it's largely unseen antagonist was truly a breath of fresh air in the wasteland of game writing. Half life one was one of the most immersive FPS's I've ever played, it didn't push the technology, but it pushed the experience, and the community has created tons of great mods. Sure Gordon Freeman is a mute, but Masterchief never says much aside from dealing with the mission or being stoic, Duke Nukem is one of the only FPS characters who expresses himself much, and look where that's got him. I will say HL2 was a letdown, hard to say why.