The only MMO I would consider playing.
Though I probably won't :P
You are better off not playing any MMO (p2p or f2p), once you get in a MMO, it is difficult to get out. Took me a while but I am finally out of a MMORPG since May 2012 l0l.
Edit: It ruined me to a point where I quit actual gaming and watching anime for 2 years (2008-2010).