If you take this too seriously, you won't like it. Buuuuuuuut, for those who have been to disneyland/disneyworld/any disney park with this ride, you will catch so many references and homages that it will suffice the slightly off story. Personally, i would have prefered it if it was based around the story of the french version of the ride. Its a great one, check it out on wikipedia, just search Phantom Manor, would have made a better film.
This is the first film that comes close to anything horror that my 5 year old daughter watched and she loved it! I was worried about a few scenes but she thoroughly enjoyed it, I'd recommend a parent watch it first before showing a child just to gage whether or not you think they can handle it (I'd seen it before), if they're scared of ghouls and ghosts it may not be a good idea lol It was a nice change from the usual Disney Princess stories!