I just don't think the 3D Land/World style of game design is as fun as Galaxy, despite how pretty its gonna be, how great the music sounds, how clever its power-up usage may be. I'm open to being surprised, but I have a feeling 3D World will be a very good game, but ultimately inferior to Galaxy 2.
I disagree because I do not think these are trying to be the same type of 3d mario, to a degree where it would be weird to compare them. I think people will have a preference, for example sonic boosting vs colors sonic.
Everything you said does not make the game inferior, you just kind of have a preference, and that is fine.