Best overall: Call of Duty 4: Modern Warfare. Only because this showed how plot could be exciting and stealthy, and launched the omnipresent multiplayer. I've posted about this game before but the "ripple effect" it had on the industry this generation has been undeniable.
Pleasant surprise: Just Cause 2. Despite being a massive GTA fan, I think I enjoyed the accessible fun in this far more than the leaden seriousness of GTA IV. It also made a good point: why stop the player from accessing all the best vehicles and weapons from the word go?
Honourable mention: Test Drive: Unlimited. It don't have the tightest handling system but buying new cars and having the freedom of city roads and countryside was welcome.
Best DLC/downloadable title: Minecraft for ridiculous addictive gameplay and reminding me of The Legend of Zelda in a good way.
Most replayed: The Orange Box. I can't say away from Half-Life 2's introductory levels and well crafted plot. The solid gunplay, shootouts in canals, the ruined aesthetic of City 17, excellent vehicle control. I suppose variety would sum up HL2 in a word.
Biggest disappointment: Bioshock 2. Loved the original, barely played four hours of the sequel. It wasn't even really Bioshock, in my eyes. Bad pacing, bad characters, torturous and disengaging setting, and felt rather pointless to play.
Waste of time/money: Kinect. Really didn't find anything I enjoyed. The concept was good, taking the Wii one step beyond, but all I really played was Kinect Adventures. Very irritating that MS are pushing this as a requirement for the Xbox One without having proven its worth with the Xbox 360.
Biggest time sink: Either Oblivion or Skyrim. Excellent locations, appropriate music, (generally) fun combat systems, if a little slow and heavy at times. I embraced being a stealth/archer character in Skyrim and the game turned out a little too easy, but from what I've read that has historically been the case with The Elder Scrolls series.
Most trophies/achievements: L.A. Noire. Got them all, although the drive in all cars was a bit of a bugger. Even though the questioning system was flawed it was nice to feel part of a world and chase crooks all over 1940s L.A. What's more, the plot reminded me of old fashioned PC adventure games in many ways: go to location A, find item B and cross-examine with person/place C. Good stuff.
Looking forward to: Titanfall. It looks like it'll cure me of the weariness I feel about Call of Duty. The jumping mechanic does seem rather "Halo-like" but it should slightly tweak the approach of a multiplayer system that is creaky and old from CoD. I do question how engaging the story will be given that it's part of the multiplayer game, but only time will tell.
Please excuse the God-awful typos in this. I must not have been concentrating.