Hard to compile such a list, many good games this gen. From the ones I have played:
1. The Last of Us
2. Uncharted 3 Drake's Deception
3. Uncharted 2 Among Thieves
4. Metal Gear Solid 4 Guns of the Patriots
5. God of War III
6. God of War Ascension
7. Journey
8. L.A. Noire
9. Resistance Fall of Men (main reason why I have chosen PS3 and MGS IV :D)
10. Heavy Rain
Honourable mentions: Skyrim, would be in top if it wasn't a bug fest and had better performance. GTA IV: almost, almost. Gran Turismo 5: spent a lot of time playing it and loved it, but I need story for a game to be a truly memorable experience. Rayman Origins: shitload of fun, great art, awesome coop fun, just shy of top ten.
Plus games still to play that I believe have a chance to end up in the top ten: Red Dead Redemption, Batman Arkham City, Beyond Two Souls, Puppetter, Tomb Raider.
So it is happening...PS4 preorder.
Greatness Awaits!
