Mega Man - He just seems like a ton of wasted potential. Compare Smash Bros. Mega Man to MvC Mega Man. The character has dozens and dozens of weapons at his disposal, yet Capcom decided to give him a soccer ball over any number of more iconic abilities. His standard move set didn't need to consist entirely of punches and kicks.I get what you're saying about Jill, but some of those others confuse me.
Mega Man: Faithful animations and classic MM weapon references. I'll give you Hyper Megaman seems weird and makes no sense. Rush Drill is based of Casshern's Friender Drill who Mega Man and Rush are based off of AND was originally supposed to debut in MM3. Beat Plane > Friender Jet.
Tron: Aside from King Servbot, she seems pretty faithful to her game to me.
Jin: This I'll agree with. He's basically like the VS equivalent of Captain Falcon
Iron Man/Magneto: Eh, I'm not sure what you're expecting exactly...?
Sentinel: Same as above, except I'm not sure where "Hyper Sentinel Force" comes from.
Shuma: Yeah, as people have said time and time again, Capcom just loved the idea of making a character out of an Alien Squid/Octopus thing and not much else.
Tron - The MvC2 Gustaff is green and looks completely different than the MML version (not just in size and scale but the overall design as well). I enjoy using Tron, but I'm just pointing out how much of an original character she is in MvC -- she's piloting a brand new mech.
Iron Man - The Proton Cannon appeared in a single comic panel before MvC. Iron Man very rarely uses the Unibeam in the comics, but the dev team went with that over his incredibly common (and now iconic) hand beam. I still don't even know what Repulsor Blast is supposed to be.
Magneto - When I think of Magneto, I don't think of a speedster doing can-can kicks and hand beams.
Sentinel - CoTA Sentinel is an original character with a brand new design who does things that none of the comic Sentinels do.