I voted GTA, but since you didn't include an "other" selection, my actual choice would be Angry Birds.
I don't see how IMO and Crash Course make this list and Jet Car Stunts COD Angry Birds and Sword of Fargoal didn't
I voted GTA: CTW. But this poll means nothing, the small range of options that you have chosen is like a pin drop in an ocean of all the good games out there.
Angry Birds. Also has a free version. Jet Car Stunts is also great. The controls are a bit floaty, but you get used to them. There's a free lite version as well. Finally, Peggle. There is nothing else to say about Peggle.
I own some of those games in your list and enjoy them but currently they aren't my most played. Angry Birds HD, Galcon Fusion, Zenbound 2, Azkend HD and others are taking up my time. I'd probably vote for GTA or Warpgate out of your list (but I've only tried half the games in your list).
A poll won't work for this..just like there can't be a best song/movie poll I don't have any of the games in the poll >> and I can't find a single favorite game