So far, I like that the game has (attempted) to be faster pace than the first Galaxy.
The biggest two flaws of this game: the stupid faceship (and even worse, all the shitty times you need to go back to it for something worthless) and all the talking from the non-playable games. Really, get rid of all the Toads, all the little wood people, etc. I am tired of seeing text bubbles on my screen. Too many shitty friends never made a game fun. Learn from Sega's mistakes, Nintendo, without committing them yourself.
I can tell there was a power struggle within the group at Nintendo between those who wanted a dumb-fuck storyline and those who had sense enough to know that it does not appeal to anybody but the furries. You can tell because while they got rid of some cutscenes and whatnot, it was almost made up for by text bubbles. So that was their crappy compromise. Non-story people at Nintendo: go the fucking goal next time. Don't relent.
Also, there are some other little niggles that I don't like. For example, the World Map -- for all its glory in place of a full-on hub world -- is illogically designed in some ways. Why are there warp pipes on the World Map that really serve zero purpose? The accumulation of little things like that can be grating when you already don't have a hell of a lot of time to be playing the damn game.
For now, I'd give the game a solid 8 out of 10. It's no New Super Mario Bros., but it's definitely better than the first Galaxy. I hope Nintendo can finally get it straight in the next 3D Mario game.