Alright, after getting quite far on Super Luigi Galaxy, here are the two things that I think were the worst parts:
1. Final Bowser
Okay, the first two were great. They captured what truly made Bowser Bowser. On the third one, it just wasn't Bowsery enough. It was just a jumble of planets. The way Bowser fought was bad, too. I mean, additional planets is great, but how come Bowser turns himself into a rock?
2. Super LUIGI Galaxy
Alright, they could have made this so much better. All they did was replace Mario with Luigi. There was even a 'twin' of Luigi who did what Luigi did in Mario Galaxy. They could have put Mario there instead. Rather than you finding Mario and getting the star, it could have been that Mario needed your help to get the star, and you do something similar to the Majora's Mask event controlling that other guy. And then, at the end, when Luigi did the final hit on Bowser, Mario jumps out of the air and hits Bowser, knocking him away, and Mario takes all of the credit. :thumb:
Oh, well...