It's very FFXI/LOTRO feeling in it's instanced storytelling. The mechanics are probably just about as deep as FFXI, where you constantly think there's things you're not quite getting. Their current implementation of the "time limit" on how much xp you get should probably be inversely realized as a time limited xp bonus, because it's just so much feel bad right now.
After a few days i really didn't feel like getting back into it, i might if my buddies in Japan get big into it like i did FFXI. Of note, LOTRO's F2P system is really cool, i've always liked that game, and their deed/virtue system is brilliant, doubly so with what they've done in the F2P world.