Harry Potter and the Half-Blood Prince, is it worth going to the theater?!

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So, recently ive been thinking if this movie is worth going to the theater for and to be honest im not a big fan of harry potter Movie series but with all the hype i am itching to go watch his movie. so what do ya think should i wait for the dvd to come out or watch it at the theater. btw, i have read a couple of harry potter books and was wondering if i want to read the book for Harry Potter and the Half-Blood Prince, will the movie ruin the it for me or not!!