This post contains spoilers. Read at your own risk.
Hmm. It's hard to say this game sucked because it didn't, but it is far from
perfect, and it is slightly overrated (but not nearly to the extent of TP). I got this game hoping it would be awesome, and I even got one of those coins for pre-ordering it. The game is good, and it feels Mario-esque, but it lacks the same magic and true Mario feeling that SMB3 and SM64 had. The whole space thing isn't even all that great. They advertised that gimmick to hell, and in reality, only maybe 5-10 of the games 40+ galaxies use it extensively. This is probably a good thing though. It almost feels like they are running out of gimmicks so they pulled this space motif out of their asses because they are afraid to go backwards and make the same thing twice, even if it was awesome. I wanted a true Mario 64 sequel and this is close, but far from perfect, similar to SMS.
Onto the subject of planetoid walking, am I the only one who thought it felt awkward and hard to control? Especially considering the camera is automatic, and flips around a lot, especially in the first galaxy. When you walked to the underside of a planet, the controls would sometimes invert, and it felt awkward and not very smooth as I found myself walking in tight circles while trying to get the direction right.
The game does have some redeeming factors though. It does offer a fair share of "massive" galaxies to explore. All of them follow classic Mario set up too. You have you dessert land, grass land (sort of), lava land (personal favorite), ghost land, and some others. There are even a few tropical areas. Even though these areas are nice, the objectives feel short and easy. Even up through the end. In particular the last area, and final battle are pretty anti-climactic. You only need half of the game's stars to complete it, and it is not too terribly difficult to get them all. SMS was difficult in a challenging way. This game seems very easy in an almost boring way. I have 72 right now. There is also very little room for exploration. Most of the stages are pretty linear. At least in SMS (which was great) you could explore the large stages and find the shine at your own leisure. This time around you're stuck on a path. Occasionally though, you can feed a certain character a certain number of plot related items and find a secret planetoid and get a secret star. I still miss the sense of freedom and exploration SM64 and SMS had. SM64 was still the best in this aspect since you could get stars out of order.
Oh, and one more thing: I am so fucking sick of Luigi being made into this reluctant panzy sissy character. No. What ever happened to the old days where Luigi was just as competent as Mario? I can't stand his new character.
So, that's pretty mush it. It is pretty awesome, but it has some flaws. But what game doesn't?