Anyway, just came back from the movie. I have mixed feelings. Well, I suppose I wouldn't say mixed, I just feel like it's kinda bad. The good parts - it's mostly fun, it's nice to be in that magical world setting, New York in the roaring 20s was cool to see through a Harry Potter lens. The bad is a plot full of holes, and really obnoxious story decisions with regards to interactions between the magical world and muggles. Like, really queasy-making issues, that are never addressed. I was also surprised at the special effects - pretty much any interaction between humans and the CGI creatures (and there's obviously a lot of that) looks pretty bad.
I don't think it's a huge spoiler, it's also mentioned in passing in one of the trailers, but I'm going to spoil this anyway:
Bigger spoilers (still not huge, it's not like the movie is very sophisticated and hard to predict):