I was able to preview Pandora, though I did not get to ride Flight of Passage and did not see the land after dark. Also I uh.. have not seen the movie. Here are my thoughts!
The land is absolutely beautiful and dripping with detail everywhere you look. The amount of craft work into every square inch of the place is incredible. They did a fantastic job of seamlessly blending this land into the park. There are some nods to the film that are mostly subtle and also tied into the park's conservation message. I believe they got this exactly right in that it's not about the movie at all, its about Pandora, another planet, perhaps you've seen or heard about it?
The queue for Flight of Passage is easily one of the best queues ever made.
I think Na'Vi River Journey is the perfect C-ticket attraction. I love that it's just an experience, no story, just an old school "ride and enjoy the ambiance" attraction. The minimal screen usage doesn't bother me because they enhance a physical scene, rather than being the scene. Agreed that there should have been perhaps a few animatronic creatures. What concerns me is the capacity- it seems very low. I haven't really been following Pandora discussion so I don't know how much this has been covered, but this should have been a people eater. Instead, it will likely have very long lines leading to higher than intended expectations. Still, I appreciate that they even bothered to include a second ride.
The main restaurant's food was decent and interesting. Both it and the gift shop are a little underwhelming, and it gives you an idea of how Disney would have treated Harry Potter, had they proceeded with it. The restaurant is definitely a Disney theme park restaurant, the gift shop is definitely a Disney theme park gift shop. Both are big, open, and have minimal theming. A big ingredient to the success of the WWoHP is how authentic the shops, restaurants, food, and merchandise all are.
If I had to criticize the land itself, it's that ultimately, despite the amazing detail and beauty, it does feel a bit lifeless and empty. I'll need to actually watch the movie to give input on how this could be improved.
I'm also going to reserve ranking the land (in terms of where it lands in my top theme park lands list) until after I actually ride Flight of Passage and also see the land at night time, which I am very excited for.