I'm just so bored with games in general. I want something new, somthing fun, and something engrossing. I think that's why I didn't like Mario Sunshine. The worlds felt a bit... sterile. There just wasn't enough to do. The fact that the worlds changed and limited you to whichever star you were going after just killed it for me. It felt like I was playing a bunch of mini games rather than exploring a huge and diverse world. It just didn't feel like Mario to me, even with Yoshi.
Mario Galaxy though, it seems very frenetic, very alive. Where in Sunshine the worlds felt empty and small, here there is so much going on that it's almost too much to take in all at once. And I'm completely aware of the irony in refering to a game that seems to be spread out across a number of small planets in this way.
It just seems like there's going to be so much to do, and always in the background you're going to see new worlds that you've yet to travel to. So much goodness! I really can't wait for this one. It was the only game that got me truely and honestly excited.