I think the problem is that Disney thinks the general public actually cares about Pandora. As if it were a real place, and people want to learn about it. People just want to ride it. They don't want to write a term paper on it.
Imagine if you went to a museum and took a tour knowing that everything this "guide" is telling you is completely imaginary, and total nonsense. That's what it feels like here. It just comes off really hoaky. No one likes to be lied to straight to the face, even if it's for amusement purposes.