Mega Man isn't too great overall, I think, but I love that he's pretty much all projectiles. His up air and side smashes are so dang useful.
<3 rockman
Mario really feels like he's a lot better now. I never really liked playing him in smash before but he feels really good now and I'm not sure why, considering he seems very similar to how he was in Brawl.
EDIT: Not a necessarily a huge surprise or anything, but I noticed that there is definitely antialiasing (looks like 2x, but it doesn't look like it's post-processing AA so that's nice) and texture filtering (trilinear? I doubt it's anisotropic on the 3DS) which gets turned off (AA) or down (texture filter--to bilinear?) when 3D is turned on. im a nerd who pays attention to gfx and spends 50 hrs playing with every setting in video games so this is interesting