Inconsistent character profiles make us flip out with nerd rage.
Any time you have two unrelated worlds cross over, there's a certain degree of rule-bending you have to allow. Of COURSE someone like Chun Li couldn't take down Galactus, but for the sake of gameplay we accept that she can. After all, it's not a very fun game if half the characters can't stand up to Hulk, Thor or Wesker.
The game's profile pages contain power grids for each character that are wildly out of synch with each other, and suggest many decades-old Marvel heroes are less capable than most of Capcom's fighting-game-only characters.