The thing is...
It isn't so much the things that were left out but the things that were added..that were just BAD.
I understand why the Scouring of the Shire was omited and how much time would have been added, but why then *add* so much NON-canonical content that isn't even correct?
I do think the movies are beautiful and that most of the casting was great. PJ utilized Tolkien experts for the sets, the costumes, the languages..but then he slips from Tolkien with the script.
I do still get teary watching the charge of the Rohirrim onto Pelennor fields (even though I know Theoden is saying Eomer's lines

) . But why leave out content and then add content he had made up?
I like the movies, I just would really have preferred less straying from canon in regard to the characters. PJ treated many of the Tolkien characters badly.