I've been playing the F2P beta for the last 2 weeks. As a F2P it's probably better than some of the others I've tried. There's enough variation while leveling that it's not the mind numbing experience I've had in other F2P MMOs. I've had some issues that concern me though; and while I understand it's a beta, it's also a beta of a game that's been out for awhile. The UI has been having issues with the quest tracker, which makes questing difficult, and I can't run it in DX11. DX11 runs very smoothly until it doesn't, apparently it's an issue they've had for quiet awhile.
Overall I'd say worth checking out. It's got a cartoony style that I realize isn't for everyone, but I like it.