I'm waiting for Aion or Vanguard Saga Of Heroes (Don't judge me. I came across a limited or collectors edition box with the game and now have it.) to go free to play.
A coworker of mine gave me a 1 week trial code when he got the game around launch. It felt less polished than city of heroes.. but if it's free now I'm thinking I'll try it again - it was still fun, even if i didn't think it warranted a purchase at the time.