[big List]
Not to be a jerk or anything, but almost all of those games are either ports or nearly the same as their PS2 counterpart. It might be a good game, but when I can play it on my TV instead of on a handheld and get the exact same experience, I'd rather do that.
In all honesty, most people play their handhelds at home, including myself. I'm not buying a PSP for a remake of GTA or Tekken when I can play something superior.