Of the six Harry Potter movies thus far, "Half-Blood Prince" is certainly the most mature of the lot. I question, therefore, why it received a PG rating. For Potter fans who have kept up with the books, this will be a refreshing review - but no more than that. "Half-Blood Prince" covers the basics of the 652 page book - such as the main relationships, the Ron-Hermione-Lavender love triangle and Harry and Ginny's beginnings, along with Voldemort's childhood and his hunt for Horcruxes. Even the final battle that is suppose to occur after Snape murders Dumbledore, is very anticlimactic, though it does tell that Severus Snape is the Half-Blood Prince.