Was he evil? Probably.  Was he driven by power and ambition?  Definitely.  Did he redeem himself?  Possibly.  Would the Companions have won without him?  Definitely not.   Does he deserve therefore to be destined to come back again and again!  ABSOLUTELY YES!

I've put links below to my favorite images of Raistlin, and to be fair, I've chosen just two from each of my Dragonlance artists.