Skies of Arcadia: On a console starved for RPG support (there were what...12 total maybe 5 good ones?) this one was by far the best. Even with the obnoxious amount of random encounters it's still ridiculously fun.
007 Nightfire: The first Bond game to actually have a Bond-style intro (it has a theme song that starts at the end of the first level). So much fun in multiplayer with various modes and little RC helicopters and tanks.
Metroid Prime 1&2: The best single player FPSs of all time. There's no multiplayer in 1 and the one in 2 is pretty terrible, so that keeps them out of the "best FPS of all time" but the music, atmosphere, and controls are all excellent.
Gauntlet: Dark Legacy: I love this game in arcades and love it even more in my house, with my friends, mashing buttons as quickly as possible and yelling at eachother to go the other way during coin challenges.
Ah yes, nerdcred obscure one:
Lost Kingdoms 1&2: I only played 1 at a friend's house and evidently they're super rare because they were only in production for a short time, but it was a lot of fun and I'm trying to find one at a reasonable price...TO EBAY!