I saw the 2d version.
Very, very pretty, to the point of visually stunning. And it isn't cheaping out at 90 minutes - you are there for a solid two and a half hours.
Are there plot and science holes? Of course! And the morals of the story are applied with sledgehammer subtlety - but that's from the point of view of someone who's seen a lot of movies, and read a lot of stories with similar messages. Someone who hasn't seen as many won't feel so beaten over the head. And, honestly, it is good messages, and sometimes we ought to be beaten over the head with them, so I don't find that too big a flaw.
An enjoyable experience. Worth seeing. Not Great Art, and it doesn't "change filmmaking" except in technical senses, but a solid evening's entertainment.