This is a true launch game: uneven, flashy, and without subtlety. It catches your attention, but leaves you unimpressed.
But let's focus on the good for a bit. Super Monkey Ball's strongest showing is its graphics. Though not technically impressive, this rendition of Super Monkey Ball features a very stylized, somewhat cel-shaded look. It suits the game nicely, and it's great that the game has placed art direction above flash graphics.
Second would be the gameplay, which works rather nicely with the Wii controller. The controls are responsive, but it doesn't prove to feel very fun. Perhaps there are other factors distracting from the "fun factor," but it's ultimately a result of gameplay.
Worst of all is the music, which I can't take for the life of me. In hell, I imagine that's all they'll play. It's loud and grating, not cute. Music doesn't need to be at the forefront of a game like this; it's not here, but it sticks out solely for causing an obscene amount of headaches.
Ultimately, Super Monkey Ball: Banana Blitz is just a teaser of what the franchise could be on the Wii. Hopefully they'll make a better sequel somewhere near the middle of Wii's life cycle, building on what was good about this game and hiring a composer that's not on crack.