Had a pretty fun time with it. The game really had momentum in the first couple of chapters, but lost it in the middle, only to regain it at the end. Bowser's Castle was a super fun culmination, being a dungeon that uses all of the different abilities your partners give you. Combat is simple, but surprisingly deep, with built-in challenge through the use (or not) of the Badge system. Star Power feels a bit overpowered at first, but is certainly useful as the game continues given that Mario is always taking damage (very rarely does he completely dodge an attack, though badges can help with this). Humor is there in the writing, but I feel like the Mario & Luigi games were all more funny than this? Maybe it's just a result of the times.

Overall, I'd give this a slight 7 - only slight though. It's definitely a good game, but I don't think I'd replay it anytime soon.