Uplink, Pharaoh+Cleopatra Gold

VTM: Bloodlines
Fortune Summoners *
Knights of the Chalice
Botanicula *
Resonance
Hector: Badge of Carnage *
Plants Vs. Zombies *
Portal
Escape Goat (IR) *

* = played through already

La Mulana
Alone in the Dark 1+2+3
Blake Stone Aliens of Gold
Legend of Grimrock
Septerra Core
Anachronox
King of Dragon Pass

Far Cry 3
Vampire Bloodlines
Halo 4
Outcast
Dishonored

Probably FTL and Kerbal Space Program.

Ace of Spades. I thought I was going to hate the 1.0 version run by Jagex, but if you just pretend it isn't Ace of Spades, and remember that it's not a WWI based game anymore, it's pretty fun. A hectic, explosions-everywhere kind of fun but fun nonetheless.

The Sam and Max games. I bought all of them over the year. Finally get to play through the rest of the second season and the third season. I played the first season (well, most of it) on Gametap back when Gametap had the really cool client.

Primordia. Holy hell, Primordia has spoiled me when it comes to storytelling. It's fantastic. The ending I got was powerful. Really powerful.

Castle Crashers. I've been having fun playing it with my girlfriend. Used to have it on Xbox 360 a while back, but having it on Steam is pretty convenient.

Super Hexagon. I did not expect much out of Super Hexagon. But I put my own music on, I load it up, and it's pretty fun. I've got several hours in it and I've managed to beat the first two difficulties, against all odds.

Torchlight II. Fun, dungeon-diving co-op game. I am really liking it.

Mark of the Ninja. A better stealth game than I could have asked for in a while. It's the perfect combo of ad-hoc takedowns and takedowns that you probably have to do the game's way.

The Penny Arcade On the Rain Slick Precipice of Darkness games. I do not remember at all where I owned the first one. And then I had the second on Xbox 360. But they are hilarious. I had forgotten how hilarious they were until I rebought all of them during the Steam sale for $5 in total.

Hotline Miami. Finally caved when I saw it for $5 on Gamersgate recently. I really like it. It's WAYYYY too violent for me at times, but otherwise, it's fun as hell. The precise, tactical nature of it is probably what I like best about it.

And there are probably more. But those are off the top of my head.

Haven't got access to my own PC at the moment, so can't remind myself of other good ones, but the fact that Saints Row: The Third instantly sprung to mind must count for something. It's not as good as its predecessor - too goofy for its own good - but I enjoyed it a lot nevertheless.

The Walking Dead: Best story in a videogame in a long time. Probably my favorite game of 2012.

XCOM: Enemy Unknown. I really, really liked this game. I usually don't play a game through twice, but I did with this one right after I had finished my first playthrough.

(Not a purchase, but I received it from a giveaway) Hotline Miami: Mindless, fun action. Finished it in one sitting.

Icewind Dale: The best D&D game I've played; except for the final boss I really liked this one although it's mostly combat with very little story elements (compared to games such as Baldur's Gate)

Carmageddon: It was just as much as fun as it was when I played it as a kid. Except for the stage with water - it was a pain trying to get opponents on dry land so I could finish them. I hope there's no water in Carmageddon: Reincarnation.

Dead Island: I like bashing zombies. This was especially fun with other people joined in.

Max Payne 3: Before I had played XCOM and Walking Dead, I was ready to nominate this one as my favorite game of 2012. I really enjoyed the action, and the game looked nice too.

Portal 2: The game surprised me positively, since I didn't except much because it's a sequel - I was thinking, what could they do to top Portal 1 which was great. The characters were really funny though and the ending made me shed a bit of manly tears. It was just that good.

These are the ones I enjoyed the most in 2012.

I wouldn't say I love them but I had or still have great fun with:
Alan Wake American Nightmare
Heavy Rain
X-COM: Enemy Unknown (remake)
Assassin's Creed 2
The Secret World (the game has its fair share of flaws but first arc was awesome)
Pharaoh

Metro 2033 the game was pure awesomeness, except for the ending.

The Walking Dead, XCOM, FarCry3, Tokyo Jungle and many others, but those are the ones off the top of my head.

I've had a lot of fun playing BloodRayne so far, I won the game in a GOG giveaway and I decided to buy the second BloodRayne game since I have enjoyed the first one. Aside from that game I also have plenty of other games I got around the holiday season that I am having fun with like Tropico 1 and 2, The Last Express, Planescape Torment(finally), Battle Realms and a few other games I haven't had the chance to try yet because of slow internet download speed and the internet I use not working at all in the last few days.

Not sure I'd say I 'loved' all these games, but I was very, very pleased with them:

Nox
The Saboteur
Trine 2
Bastion
Planescape:Torment
Spec Ops: The Line
Faerie Solitaire
Kingdoms of Amalur:Reckoning
Lord of the Rings: War in the North
Portal 2

DE:HR

That is all.