Quake 1

It's really difficult.Realy Really difficult.
Even though they are not my favourite games of all time (they are however my favourite games of this generation).
It would be either Uncharted 2 or the Last of Us. I really can't choose the one over the other without regreting it but I'll do it.
So....Uncharted 2 cause it was made earlier in the generation.
But they are quite different so I can't say U2 is better than TLoU or vise versa.

NaughtyDog reached their peak in this Gen hope they continue to do as well in next gen.

No such thing as 10/10.

If I had a gun to my head though, I'd say Pac-Man.

Complete non-sense.  A game should get 10/10 when it is genre defining.  When it raises the bar on what games of its category should be, then it is capable of earning a 10/10.  If it has that, then it should be a damn near perfect game in every other aspect. 

The Legend of Zelda: Ocarina of Time is a 10/10 for me, even though I believe Majora's mask was the better game.  Ocarina of Time was genre defining.  I believe that it was Gametrailers who said that Ocarina of Time was a walking patent office of original ideas.

In my opinion the first half of GTA V was 10/10, but it still came out to a 9.7/10 in my book. I remember thinking how it was the perfect game about half-way through, but a few things after that brought it down... such as the rushed ending and michael and trevor's endless bickering. GTA: San Andreas had a much better ending, wish they could have come up with something better.

Halo 2 was 10/10.

Red Dead Redemption. So much to do. So much packed content. Incredible DLC. Brilliant storyline. Memorable characters. Solid gameplay.

Final Fantasy X, including laugh scene.

Yes!

Persona 3.

I just can't find any faults in it. To me, it is THE perfect game in every aspect.

Bravely Default Demo (I don't have the full game yet.)

If Demos don't count, than I have to give it Pokemon Black and White. That story, wow.