multiple thoughts:
Mass Effect 2 was of course great, enough of you have already said it, so I don't need to justify it
Red Dead: Redemption was just great
Splinter Cell: Conviction was also really good, it was the first stealth game that I ever played, and it was a satisfying experience
and now the one that nobody saw coming, No More Heroes 2: Desperate Struggle, fucking hell that game was fun to play, I had the first one, and was curious to see where the sequel could go, and I was not disappointed, the money getting mini-games were now less trivial, the four available beam katanas were all good enough to use alternately as opposed to one simply replacing the other like in the first, and overall I just had tons of fun with it, and really, in my book, if a game makes me enjoy it as much as I enjoyed No More Heroes 2 on gameplay alone, the developers have more than succeeded at delivering a quality product.