Actually I disagree on some things. Call the artstyle uncreative all you want, but it was certainly done to convey a feeling of being in a new dimension, so it was done well, Bowser is the worst playable character in the game, although Peach is not off the hook herself, Chapter 2 wasn't exactly tedious besides ONE part, although it was lackluster and the old battle system wouldn't work with a side-scroller, and as such, it's actually ok to have them be linear in the style of going from A to B, and badges too wouldn't really be as useful as they would be in the older games. Lastly, doesn't mean if Pixls are all the same and don't talk after their introduction that they're inferior to partners. In fact, I think they're better: you consider them as items and therefore don't need development, while partners are actual characters whose personalities are just not that fleshed out and leave much to be desired. But that's just my opinion.
Of course, maybe its original characters are a bit overrated but that doesn't mean I find them bad, and tbh Bleck is better than Dimentio by a long shot (in fact, Dimentio is pretty stupid), and besides the story, Chapter 6 is the worst. And I highly agree that the bosses are for the most part, disappointing, especially BoneChill.
Of course, maybe its original characters are a bit overrated but that doesn't mean I find them bad, and tbh Bleck is better than Dimentio by a long shot (in fact, Dimentio is pretty stupid), and besides the story, Chapter 6 is the worst. And I highly agree that the bosses are for the most part, disappointing, especially BoneChill.