Since I last posted, off the top of my head:
Dragon Age: Awakening - Not sure why people complained about this one, seemed like good new DA goodness to me. The Architect was creepy and there were some great choices to make...
Dragon Age: Leiliana's Song - Excellent add-on, really enjoyed it. The new music was lovely and giving the character a voice was great. No real choices to make though, which sucked. So I guess like a 7 overall?
Monkey Island 2: SE - Loss of intro is a travesty, but everything else was lovely. Mouse controls actually worked!
Fallout - Replayed the original Fallout for the new PC Gamer forums and their "gamer club." Played a one-hander pistoleer for the first time and boy did he suck towards the end killing mutants...
Singularity - Bioshock with polished Raven-style combat... excellent fun, just don't call it original.
Entire Splinter Cell Series - I played them all over again after completing Conviction... Chaos Theory is still the best, followed by the original game. Pandora Tomorrow and Double Agent are okay, but have lousy PC ports (especially Double Agent). Conviction was a great game, but not a great Splinter Cell game.
GTA4: Ballad of Gay Tony - Freaking amazing, an honest to goodness expansion and one with the highest level of quality. Loved every minute of it.
Mass Effect 2: Overlord - The best DLC for the game by a mile and a very worthy 2 hour questline. The hub world idea is great, I hope they use it again, and the story, combat and locations were all excellent. Well worth the money for an ME2 fan.