PSP: Star Ocean 2
DS: Children of Mana. I'm probably the only one to say that so far. :V
Wii: MadWorld. I still find that to be like one of the best, if not the best, game on the Wii.
PS2: Onimusha 1 and 2, and Front Mission 4, and SMURF YES GOD HAND PLAY THAT FIRST

SNES: Lufia
Retro: Wild Arms 1, SMT III