Fans of the book series will be, for the most part, disappointed. The actors are too old to fit the roles of the 14/15 yo. Characters they are meant to portray. Sadly, the SFX is terrible in many places - mainly in the area of actual creature footage, which would have benefitted far more from being Computer Generated. Good, lightweight entertainment if you enjoyed such series as 'Goosebumps', but if you're a fan of the books you'll be sadly let down by this crude attempt to cash in on the success of the books.
