It's the genre and game - They took the "safe route" which has been done to death and back and quite frankly..leaves much to be desired. MMOs and gaming in general have stagnated because if a developer tries anything out of the box or unique the game fails because it's not "the same crap as every other game". For example people would refuse ARR if it wasn't a generic Quest Grind and nothing but Dungeon Instances type of MMO because that's "industry standard" now.

Of course you'll have people state the game is highly successful and the most popular MMO to ever exist and there's absolutely no problems with it, but those people tend to be the ones who love this style of MMO to begin with.