Well to be honest I didn't get to play as many games as I would have liked. The exhibition hall was only open from 10:30 am to 6:00pm.
We had to run around a lot because most of the booths were doing raffles (had to be there to win). I had to pick and choose...
The lines for Duke Nukem, Portal 2, and Mortal Kombat where 3-4 hours long.
The big ones I got to play where....
Marvel vs Capcom 3
Star Wars Old Republic
Star Wars Force Unleashed 2
Infamous 2
WOW Cataclysm (with Nvidia's new 3D video cards and glasses)
Fallout New Vegas
Dead Space 2
End of Nations
Rage
Gran Turismo 5
Leauge of Legends tournament (at the Alienware booth)
Need for Speed (cant remember which one)
Castle Crashers (on a coin op arcade machine)
I also playd a bunch of Indie games (I cant remember the names)... and of course Counterstrike!