Isle of the Lost gave me that same feeling of watching those campy kids live action Disney movies from my childhood. The characters were over dramatized and situations a bit silly at times but it was all in good fun. 
 I think this rag tag group of wannabe teen villains spawned from the classic Disney villains will win over the readers that love those Disney movies. Though I guess it could go the other way but I think I enjoyed it because I went into reading it expecting it to be campy. I watched those Disney Descendants character trailers on YouTube before reading and that really helped set the tone of things for me. Tho the book I think was slightly father then the trailers seemed. Which I'm thankful for because I think the old school Disney cartoons were much darker. 
 Underneath the campy story is a sweet story of a group of kids coming to realize mire about themselves and what they want rather then just trying to be what they think they should be. I personally think this one would fit better into the middle grade genre because of the overall tone and type of adventure reminded me more of middle grade fiction but could very well be enjoyed by Disney fans of various ages.