Hmmp... Mario Galaxy was OK, but frankly a disappointment for me. It has lost some major factors that made M64 so good. First off, and most important, it was WAAAY to linear for my liking. In SM64 in the first level, you could get: The king bomb-om star, or the chain chomp star, the 8 red coin star, or the 100 coin star. Anyways, what I am saying is that Mario Galaxy was broke up like this: 1. Go to small planet. 2. find every piece to every jumping star. 3. fly to new planet. 4. repeat steps 1-3 until you reach a planet with a star.... Pretty boring. There is NO REAL exploration, you are stuck on a god forsaken rock in space, Super Mario sunshine had colorfull levels, no black holes, multiple paths, and you can explore and HAVE FUN.
Now there are lots of thing I DO like about Galaxy, such as the gravity element, the bosses, the humor, and the graphics, but still... The few levels that were open to explore (land levels vs. space rocks) where fun, such as the bumble bee stage.
Finally as for Mario Galaxy two, I will give it a shot. It has potential. But from the video it still has those dreaded purple coins! Man, I hate those...
All we can do is to hope for the best!