Juggarnaut was a genuine hero though in his own right for a while.  Sure he didn't have the gem but he was still strong as hell.  Plus I genuinely loved that storyline where he befriends the student and through the kid he finally finds someone who believes in him and doesn't think less of him. Though I also hated how they ended the story so quickly.

Also I actually dig the idea of Quicksilver being in the Young Avengers.  So far I'm sure he'd like to get away from the X-Men and both Quentin and Ms. America would certainly peak his interest in people to hang with.  Plus SOMEONE needs to introduce Quentin to proper punk music.