Uncharted (by far)
Infamous and Battlefield are nice too...
Final Fantasy series, Xenogear/Xenosaga series, and Wild Arms series.
Metal Gear Solid. The reason I bought all my sony consoles lol.
Without a doubt, Uncharted! The story, the various aspects of gameplay, the graphics and how it pushes the PS3 and use the functions most other developers forget about (SixAxis anyone?).
I like Ar Tonelico series from PS2 era to PS3, I just realize it was this series that makes me buy PS3 from the very beginning
I just hope there is the 4th one ^_^