I bought a Wii for this game, and now I think it's worth it!
Control is basically the same as the first game, but now you can fly and charge-shot, which adds more variety to the combat.
The level design and the Boss battle is fucking amazing. Imagine a rail-shooter version of the God Hand. You need to learn Bosses' patterns, dodge every attack, and counter the enemy at the right time with your blade.
The music is also better than the N64 one, so epic.