I love the fact that he made the Hobbit into three movies. He should've made LotR into at least 6 four hour long movies. They were really good for what they were. But could've been sooooo much better had he actually included more. The extended editions are a step better. But still don't fully grasp everything, IMO. As for what was included in the Hobbit, anybody who has read the appendixes in the back of LotR and/or the Silmarillion and the History of Middle Earth (or even knows about these many attentional books he wrote regarding his world) knows that most of this stuff that's "added" is cannon. Not "all" of it is though. I was disappointed with some of the character  design choices more than anything else in the Hobbit (I blame Del Toro, who I love, but I don't love his designs in Middle Earth).