munkiesarus
swimming upstream
Lol, which is probably why she won't be in the game.
Honestly, her reality altering powers are just too damn annoying and hard to explain. The fact that they are limitless puts her as that one person who you always want on your team of 4 X-Men. Imagine this:
You've tried EVERYTHING you know how to do: Nightcrawler's teleporting, Jean's TK, Wolverine's just plain Wolvie-ness, Cyclops psycho beams...NOTHING works! Its probably just some tactic or puzzle you've got to figure out, but nope, with Wanda's limitless powers, you'll end up putting HER on your team, whereas you don't need her at all!
Which, though a vague description, is sort of why they won't have Wanda in the game. At the SLIGHTEST hint of hardness, you'll put her uselessly on the team just to try and work your way out of the problem. Know what I mean?