52. It could be 54 or so if you count playing demos of some games, like Heavy Rain in my case. Some games like Dark Souls, I've only really played like 5 to 10 minutes of (because I don't want to get an achievement through GFW if that shit gets removed while I'm in the middle of a playthrough or whatever) but I countedt it anyway.
The ones I didn't play include:
- Dragon Quest IX
- Far Cry 3 (have played Blood Dragon though)
- Valkyria Chronicles
- Fez (have played its demo)
- League of Legends
- Crusader Kings II
- Forza Motorsport 3 (have played Forza 2)
- Gears of War 3 (have played Gears of War 1)
- Just Cause 2
- The Walking Dead - Season 1
- Heavy Rain (have played its demo)
Damn shame Ghost Trick lost to Last of Us while that poll was active. I'm probably one of the few of whom who has played the both of them, and Ghost Trick was the clear winner, of my heart.