I thought Diablo 3 was pretty good, as well.
I just am NOT a fan of the "always online DRM", when I was easily able to GO SOLO the entire game no problem.
Granted, it is quite fun, when playing w/ others online.
Eh, I loved Max Payne 3. Just finished the SP portion last night.
I thought Mass Effect 3 was great, except for the last 5-10 minutes (the end stuff), more or less.
I think out of the 40 or so hours I played Diablo 3, I probably only enjoyed about 2 hours worth; the majority of that was playing through Insanity with 2-3 friends, woefully underequipped. We did manage to defeat Diablo but it took 45 minutes! (thank goodness for no enrage timer on the big D)
I wanted to like MP3; I generally am a big fan of Rockstar games (esp RDR and Bully but even commonly maligned games like GTA4 and LA Noire). I'm not sure why I was so disappointed by it, but perhaps its linearity (and unrelatable protagonist) turned me off from the "story" crammed down my throat.
I loved ME3 quite a bit, though not as much as ME2. The multiplayer was quite fun with friends, but I eventually grew to despise the IAP roulette wheel of doom due to its uneven and random progression system. The game itself was great, though there were many changes from the previous two games that I thought were questionable (especially the "readiness meter" and the fact it made hardly any impact on the ending). The ending... well this horse has been beaten quite enough, so I won't get into it.
When I say my biggest disappointment this year is D3, it's not because it's a bad game. My biggest disappointment last year was Heavy Rain (with DA2 closely behind), though neither were bad games. They just completely failed to live up to the hype and/or personal expectations.