I just realized that this thread will contain lots of spoilers! Haha.

Anyways I do concur with you regarding the FFX scene. To watch that scene again, I deliberately reload the save file again. That scene was done in a very beautiful way. Suteki da ne suits the scene perfectly.

As for me, 2 scenes from Crisis Core. The first one is the battle between Angeal, Genesis and Sephiroth. Damn, that battle scene was effing epic. My eyes were totally glued to the PSP's screen. One of the most memorable game scenes for the PSP. The other one is the ending. Total tear jerker. Cried so much.

P3 - The scene where Yukari and Mitsuru had a heart to heart talk. Very touching scene. Shows deep friendships. Was glad they finally got over the misunderstandings. There's also a scene where Junpei, Akihiko and MC were trying to avoid the girls in the hotbath. In the end the girls threw buckets at them. Very funny scene.

There are of course many other memorable scenes from other games but I can't think of them for the moment. These are the recent ones. It's hard for me to recall the ones from MGS. MGS games are always packed with amazing cutscenes. Moreover, they are really lengthy. Well, not only quantity, but quality too.