I've played every MMO going. My main for years has been Lotro, but that game has sadly died now since it went f2p a couple of years ago and there's very little to do.
Neverwinter however despite also being f2p is non stop even at level cap. There's always something to do. The game is amazing and it's free! It beats every other MMO going and has a great community
My only grumble is the graphics but then again i suppose that's to cater for low end computers.
Scores:-
Graphics 7/10
Gameplay 10/10
Fun factor 10/10
Stability 10/10
Sound 10/10