Pan's Labyrinth is a very good litmus test. If someone doesn't like it you KNOW they have no real taste in films at all! Seriously, it's a FANTASTIC film, even if it is in Spanish with subtitles, and it's also too much for kiRAB - for a short time I was wondering why it had been given the 15 rating, then...well, just watch it! Just not with little kiRAB, unless you want them to see people being killed in fairly realistic ways (it's by no means a violent film though).
The Faun (the film's correct title is 'The Labyrinth of the Faun', the name 'Pan' is never used) and the other creatures are the best makeup and costume effects I have seen this side of Lord of the Rings (good job del Toro is doing The Hobbit then!). And the story is moving, brilliant, exciting and sad all at once. Personally I think the ending is one of the best I've EVER seen and gets me every time.