I posted a mini review on my twitter, but I'll elaborate a bit here and still keep it spoiler free.
In short, I think the building looks amazing, as does the pre-show lobby. I do like the pre-show much better, and having it be a shorter length definitely helps as well. And I absolutely love that it's not 3D.
The inside of the theater also looks great, and the seats are very comfortable. As for the movie itself, it does it's job... to me, nothing super remarkable. But when you do get to the 180 degree portion, it's very impressive and fun how they interacted with the theater elements itself. It'll give many opportunities for repeat visits to catch all the sight gags, as I'm fairly sure there's got to be quite a few going on.
My largest complaint is the motion of the seats. There are some very cool and interesting motions, but some of the jerky motions are a bit violent for me (and I'm a huge roller coaster fanatic, so I'm not adverse to jerky rides--but this was very jarring to me), and make me recall what I didn't like about the motion seats in Shrek. And those violent/jerky motions are relatively frequent. It's something I'd perhaps hope they'd tone down a bit in time (not unlike how they toned down the motions in Transformers after the initial opening). That would make it much more re-rideable.
As it is, I do think it's a good addition for the park, and I'm curious to see future iterations of the attraction as they (hopefully) put in new movies over time. But until they tone down some of the seat movements, it's not quite a home run for me. Or I may just sit in the non-motion seats and see how that plays out.