Well i just looked at the lowest review, it's 75/100 and short written text says:
Fun and simple with loads of content to keep us busy. It's artistically brilliant, and its OST is a masterpiece. However it's extremely easy and too simple when it comes to the game mechanics. We still have to wait and see what is yet to come, so there's definitely room for improvement. It could have been better, but it's still special.
That was posted on October the second, before any heroic raids were avaible or pvp gear was obtainable. Despite that what "game mechanics" are expected? The full review isn't avaible so it's hard to tell but there are many improvements being made between every expansion release and they never wanted to recreate the game totally - that's for sure. As mentioned a few post above, i'd wait a little longer before releasing a review that seems only based on the quests. And we all know those regular quests aren't the major part of an mmo over.