What's the best game you've ever won?

Well I won Arkham Origins, Bioshock Infinite, and Tomb Raider all very recently. Only tried TR so far, but its pretty good.

My luck ain't that great, so I've only won two games. :(

I won a 5000+ entries giveaway of Tombraider just after it was released.
Turned out the key could only be activated in Asia....
After that I joined some groups and have won numerous great games

Bad Rats

Can't really tell, because I usually only play them a little. Probably Dragon's Age, which I won from Kitguru.

Probably Batman AA.

Fallout New Vegas Ultimate Edition.

Fortix
So far anyways. Pretty new to the site and the steam setting. Hoping my future will be bright in many won giveaways :D In the meantime I have to give some giveaways.

Mission Runway. I got myself kicked from a group in order to win that.

Quakecon 2013 bundle, i think. Also, SpecOps: TheLine 3 days after release, GTA complete pack, Darksiders II season pass 1 month after release.

Saints Row IV, Borderlands 2, DI riptide, Skyrim, Max Payne 3 ....and more good games ..

i won fear 3 which was actually pretty cool :)

Rapelay

Limbo so far, although I haven't tried Rochard or Deadlight yet and I like the look of them.

Puzzle Chronicles.

civ 5, sleeping dogs, xcom enemy unkown, saint row 3, borderlands 2

Human Revolution.

X com EU, already spent more than 40 hours in it... will probably buy the dlc as well, it looks awesome.

Probably DiRT: Showdown,

Didn't play it yet, still too busy with DiRT 2

Mirror's edge

Bioshock

Burnout paradise

Rayman Origins, XCOM Enemy Unknown, BioShock, Saints Row: The Third, Red Orchestra 2 GOTY.

Terraria.

The Binding of Isaac