I've read some reviews, but haven't gone personally, but I think one of the main detractors is that there are no windows, so you are pretty much in a "bunker". So, if you are one who likes to open the shades and breathe fresh air, then that's not an option. Also, as Jeff was mentioning about the story aspect. I heard the story's really interactive and that you could spend a lot of time in the hotel involved with it that you don't get out to the parks and do rides.
Again, these are just a couple concerns I read about, and it all comes down to the kind of person you are/vacation you want: do you prefer to go outside and ride/see the attractions, or do you want to complete the mission (if that's what it is)?