I just started it & I think it's great so far. From what I've read around a majority of the people seem to like it...
Definitely feels very polished, looks great, I like how some of the instances are integrated. The character creation had a good amount of options you can choose which also depends slightly on what region you are from (Gondor, etc) I'm not into PvP...but it is supposed to be pretty neat with the Raids VS. Raids VS. E style that they have going on.
Biggest complaint I've heard is that it's very "WOW-ish", which I guess isn't a BAD thing really. I would probably buy it & subscribe...but I don't know...I'm just not a HUGE fan of the LOTR franchise.
It should do well though...