Forget MMOs, try a free to play ARPG. My favorite is path of exile or POE -

http://www.pathofexile.com/

I played that game sooooo much. The devs are great, its f2p, and they are strongly against pay to win. If you can stick with it for about 4-5 hours (it starts very, very slowly) it picks up FAST and you'll be hooked