Yea, there are no games I've played that I couldn't point out any faults at. That being said, there ARE some games that the faults are rendered almost meaningless by the rest of the awesome game.
Halo 2- IMO, the best Halo single player ever, and the multiplayer was like crack....despite the balance issues caused by it being a bit rushed.
Call of Duty 4- Just an all around fantastic game....though it's campaign was a tad bit too short, and there were some serious balance issues multiplayer-wise.
Mass Effect 2- Just about everything I want in a game....and planet probing, but post-patch, it really wasn't that big of a deal.
Yea, those are the only games I could give a "10/10", though Warcraft 3 and KotOR are both damn close.