Drinky's right though. The games will still be great, it's perfectly acceptable 3D (unlike the DS, which is sort of borderline, right at the start of decent 3D at best), games will look a bit better than last gen, especially further into the system's life...but the graphics are nothing more than that.
As for MP3, I'm excited. Some of the wiimote stuff sounds great, true, but the REAL reason I'm excited is that it drops things I hated from Echoes. No more dark world bullshit. No more ammo (well, not from the impressions anyway, I guess I don't know for certain there won't be beams with ammo). Almost inevitably a return to varied environments. Until the Sanctuary Fortress, Echoes was too samey, which really annoyed me after MP1's great environemtns. But with the new games visiting different worlds, I can't imagine they wouldn't take advantage of it to give us more varied locales.
Oh, and MP3 does look better than the GC games apparently, but it's only noticeable in things like effects from explosions, or more enemies, or larger environments. Probably won't be able to tell much difference until we play the game.