I saw the movie last night, and I am a faithful reader of the books as well. I did indeed feel like they skipped only some very minor parts, but overall, it adhered very well to the book, I thought. In fact, I don’t think they strayed from the plot at all. I mean, straying from the plot means that the movie went in a completely different direction, and this movie kept well until its climax. Everything was good with the plot, but yeah, they did skip some minor parts that just didn’t really have much to do with the plot anyway (like, the Dursleys weren’t even shown once! But really, what do they have to do with the return of… well, I shan’t say 😛)