Okay for starters don't get me wrong, I am so hyped for the game, but there are some things that disappoint me.
- The return of FLUDD. I love the device itself in SMS, but it just doesn't work in the game. It barely does damage and is hard to land. I wished they could have done a different approach to it.
- Mario Finale is still disappointing. It should be a more devastating attack imo. Or just push the opponent off the stage completely.
- Power Star. What a crappy Final Smash is that. Rosalina is great in all ways except that. It would have been better if the power star kept moving around with her while walking.
- Konga Beat, really they returned that? I get it will work more effectively but it just is lame and still not effective. I would have liked something that was a throwback to his arcade games. Maybe him going above the stage and throw barrels down to the ground.
- Toon Link. I don't like his inclusion again overall mainly because they now have so may options for other characters, especially Impa. I still like Toon Link but I think it would have been better to at least give him a different Final Smash instead of exactly the same one as Link. Couldn't they have done something involving Wind Waker?
- Landmaster is still too long in play.
- Sonic is just too plain. Three moves that work similar. They at least could have changed his side-special or something. Everything of Mega Man and Pac-Man is sooo different but they just don't seem to put any effort into Sonic.
- Swimming being removed kinda sucks.
- Mewtwo probably not returning because of there already being five Pokémon characters.
- Chance of Ridley not appearing although Metroid is such a big franchise that really needs more reps instead of for example Star Fox.
- There being no Story Mode, for a reason that is just silly.
See it's not that much but they are still some things I'd like to point out.