Super Mario Galaxy is the best 3D Mario EVAHR!
I bought it yesterday and got a good 2 hours in, and already I'm enjoying it way WAY more than any of the previous 3D outings.
It's incredibly impressive for a Wii title, it looks great, it's completely fullscreen wide-screen (all other games I've played on Wii looked either stretched, or still had some margins at the left and right of the screen), vibrant with color and detail, and it runs smooth as a baby's butt.
Also, orchestral music! Yes! FINALLY!
There's still plenty of midi as well, but a good deal of it is orchestral so far, and not just cut-scenes or anything either, stage music is done in great happy-go-lucky orchestral tunes that made me go "why didn't they do this before!?"
The opening sequence contains an orchestral performance of SMB3's Airship theme, but all the rest of it has so far been original music.
Oh, and there's a midi arrangement of SMB3's Athletic theme (if that's the name), which was fun.
As for the game, it's just so much fun! The controls are spot on and haven't changed much since Mario 64.
But what makes this game so much more enjoyable than the other 3D games is that you no longer have to plow through the same stages over and over again to get all the stars. That is, each stage does have a central 'hub' of sorts, but for every star task you will be whisked off to different asteroids that you couldn't reach before, all of which are compact, have their own theme and are just plain fun to navigate through, thus staying much more in touch with Mario's short level-based 2D origins than the rather boring open-ended worlds in Mario 64 and Sunshine.
Plus, I got it new for 5000 yen, which is a complete steal.
Man, 2007 is turning into a SWEET year for gaming!