I do agree in most points, half of the added stuff with the Hobbit films never existed in any of the books, I feel the events with the White Council at Dul Guldar (is it?) were worthy additions as they exist in the referance materials and in snippets of conversation elsewhere in the books themselves.
A lot of the other stuff such as the elves and orcs attack and the attack on Smaug were unwarented and needless.