Yeah, I was and wasn't surprised by the common complaints brought up in the reviews -- they reflected pretty well my own misgivings from the preview material but I didn't expect them to bother the professional critics who saw the whole thing so much. There are next to no rave reviews coming out thus far, and that's surprising for a "traditional" Disney fantasy musical.
One thing concerning is that many of the less enthusiastic reviews cite that there is no clear theme or message; that the "rules" of the film's universe are overly complicated, unclear, and raise too many logical questions (at least one reviewer saying that if it picked one or two of those questions and explored them, the movie would be better for it). If a complaint like that is so common, that suggests a fundamentally broken story, or at least one that the film's other elements (characterization, humor, visual artistry, music, etc.) can't overcome. We'll see if audiences are more forgiving; they might be. Good reviews have never guaranteed a box office hit, and bad ones never a flop.