My bad, most
of what I've heard so far is positive.
From what I understand, most of the complaints refer to the length of Na'vi River Journey and the existence of only one AA, no doubt worsened by the fact that most people so far have waited several hours per ride.
Obviously, I've never been out to experience the area myself, but most of what I've seen makes what is on offer look impressive, even if there could be more of it in multiple places. Whether or not it's worth the wait of five years of construction and five hours in a queue on the day is debateable, but the quality of what's there looks high.