Ernest, you've stated that, "books are not movies", I agree. That very assertion guarantees that the book MUST be different from the movie to be a good and successful movie.
Jackson has to create a believable and continuous world that will fit with
The Lord of the Rings. I believe that creating that world, making the story more complete, with story arc from beginning to end (as a good story should)and more tightly integrated with
The Lord of the Rings is what will make
The Hobbit a good movie. Jackson's four Tolkien films will be taken as whole as the four books are. There are two different stories but each is an adjunct to a greater history that encompasses Middle Earth. We cannot get around that. Tolkien himself created events parallel to Bilbo's storyline to better explain that history and how the
The Hobbit storyline is part of the overarcing storyline which begins with the
Silmarillion and doesn't end until Gimli and Legolas sail to Valinor. The storyline of
The Hobbit serves the history of Middle Earth; all the books do. Maybe it wasn't intended to do so when Tolkien first wrote it, but that's what he made it become. The history of Middle Earth is the main theme which is why they were written as romances (in the literary sense), not novels. To truly serve Tolkien is to bring as much of that history to life as possible.
The Hobbit does not exist independently of the world in which it exists. Bilbo doesn't either. To say that the events of Dol Guldur have nothing to do with Bilbo is ignoring that the story of Bilbo has an enormous impact on Middle Earth. Thorin & Co. only go to Erebor because Gandalf finds Thrain II and gets the key to the secret door. Gandalf leaves the company specifically to assist with the attack on Dol Guldur. In the book it's believable but in a movie Gandalf disappearing only to reappear later and say something to the effect, "I had other things to do" without any explanation, is a lame plot device.
Film is a medium that commands an explanation of every plot point lest the believability fail. A tight prequel or sequel is one that follows everything that was brought to light in the other episodes. The film must bond each reappearing character and each plot point, piece by piece, lest it become a clumsy exercise that loses believability. Film does not have the luxury of time that books do or the ability to fully narrate what the author wants to convey. Those things must happen through on-screen plot and characterization. Since sequels necessitate continuity and since film requires on-screen action to express plot, it is of the utmost narrative importance that
The Hobbit, on film, explain exactly how it fits into the bigger picture.
The events that take place during
The Hobbit, including the White Council and the events at Dol Guldur
are faithful to Tolkien's vision. The added plot points, the change in Bilbo's accession of the ring, his lying to Gandalf, and the contents of Appendix B in
The Lord of the Rings are his final vision of that piece of history. To remain faithful to Tolkien means being faithful to the history of Middle Earth and the characters he's created. Jackson has not been faithful to the books
as written, as it would have been impossible and introduced some corny elements that take being
in the midst of reading to relate to the story. Bombadil on screen would have not worked at all unless he was significantly changed. You can argue that the Arwen storyline was in the book but he purposely supplanted Glorfindel for no other reason than to introduce her. Within the film it works, though it's completely contrived. As I have not suggested anything that is not in the canon means my vision is faithful as well as being more complete and better integrated with the films that follow than the book could do on its own. It also allows for some really awesome screen events that, in the proven hands of Jackson and WETA, will keep audiences happy as well as serve a plot point for events to follow in the next films.
If I'm disappointed by the results then I am. I'm sincerely touched by your concern for my expectations

but I do realize it's just a movie. I'll live. I have to say also that you do not, unless you have some inside information, know just what it is Jackson, Walsh, and Boyens have planned. I don't think even they do at this point, but if you do please tell us! I will, however, do my best to let them know why I think my vision of
The Hobbit will the best one.