This is your fairly standard teen-horror fare from this generation. It has a couple of decent name actors, a recycled plot that we've seen used in various other movies and the usual first-world problems that teens face at high school. The lead character makes wishes to get rich, get back at the popular girl and to even become the popular girl herself which sounds about as interesting as cutting my toe nails. It's even made worse that it's difficult to feel any sympathy for her, she's kind of a catty bitch in her own right.
There may be a demographic for a movie like Wish Upon, but I'm certainly not it.