Saw a preview for this and thought is was good (great in comparison to the preivous Belle show). The surrounding area looks far superior to the rest of Fantasyland while the interior is nicely done too. Lots of details to really sell the "story", my favourite being the bite mark on the book. Kids were touching everything because of the lack of barriers though.
Mirror effect looks better in person as do the other spaces and AAs. The books in the library are not flat, but have curved spines as they should and the projected face on Lumier looks more natural. The library also appears larger too and has some dramatic lighting during the performance. The hallway with the Wardrobe doesn't really look like BatB, so that could have been improved.
Everyone gets involved in the show, even those who aren't picked are still encouraged to participate with "wolf howles" and knee slapping and the like. There was much lol and "awww" on the part of the audience I saw it with. At the end only the people who did however got a picture with Belle and I didn't notice any autograph taking either. This must have changed to shorten the time between shows.
Shocked to see no gift shop at the end (but that's good) and there's no real transition back "home" so that's a continuity error, but so is having human helpers in the castle before the curse has broken.
This will be very popular when finished so I'm glad I got to see it now. I don't think it's "overdone", I'm glad to see Disney spending some money on the new stuff. The argument should be why corners are cut elsewhere, not "it's too much here".