Sure, many of the MU characters are "just evil". But sometimes it happens that way. There are certain people - both in reality and in fiction - who simply ARE evil, without ambiguity. I don't see anything wrong with depicting such things.
But if you want MU characters who may not be pure evil, look at Forrest. He was a badass, true. But in the end he stayed behind and sacrificed his life so that his crew could escape the ship. That sound evil to you?