I barely play any F2P anymoar, since I have money now and P2P is less expensive than F2P...
(Last F2P I enjoyed was Mabinogi, I really had fun on this one, the atmosphere was great)
Also as far as Dragon Prophet goes, I logged in, saw the animations and uninstalled the game.
And with RO2, I logged in the game, saw the camera and uninstalled the game.
I have some standards and those 2 things are the most important for me to be able to get into a game without it feeling like a chore.