I don't think they have neccessarily "butchered" the books, I just think that there have been too many details that couldn't be addressed in the time alloted for a movie.
Out of curiosity what are some of the bigger things that they've left out?
The biggest one for me is not explaining who "Msrs Mooney, Wormtail, Padfoot, and Prongs" were on the Marauders map?
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