So, I was playing the demo, and I think it's pure awesomeness. Playing against a bot at level 3, feels like Brawl. Playing a bot at level 5-7, feels like Melee.
"Level...9" - Leader of Star Command, Buzz Lightyear movie
Feels very high speed actiony. I like all the characters in the demo, even Mario, who has the same moves and who I despised in Brawl, appeals to me in gameplay. Megaman is great in some aspects, my only complaint is that he has too much projectile attacks, but it fits his character I guess. Villager is by far the best character in the demo in my opinion.
I can't wait for the full game, "and it is going to be, fantastic..." - tenth doctor