No I haven't played an MMO yet for 2 reasons.
1. MMO's require 100s of hrs and I've got other games that I want to be playing.
2. All MMO's I wanna try out like, WoW and ToR, require a monthly fee that I'm not willing to pay for.
That said the move to free to play may just sway me to try one in the future. That way I can play an MMO for a few weeks and can take a break to play something else without wasting $15 a month on something I'm not using at the time. We'll see. I'm very interested though...