Rabid fans of the movies, vs "Peter Jackson is satan incarnate and must be stopped". The latter is left over from print-fan memes during the original run of LotR, who would hate the movie no matter what he did, not because it's a movie, but because it's not the book. Print fans come in all shapes and sizes, and have all sorts of justifications for their views. I find it interesting that, back in the day, of the print fans that believed Lord of the Rings should be made into a movie, it was generally believed that only a 20 hour miniseries would be enough, in order to capture every scene and every song and poem, and the elves should be CGI because people weren't beautiful enough, and today we have print fans that are saying that three movies was too long. What the hell make up your mind.
Then there are the print fans who would be absolutely against any film, generally justified as "it substitutes Jackson's imagery for the reader's own" or somesuch, and from there leads to a place of madness, where calendars, posters and even cover art are forbidden, and the only way to read the stories should be on loose leaf paper from Tolkien's own typewriter.
I digress. Anyway, for those who need a more faithful light hearted Hobbit, there's still the Rankin-Bass film from 1977. They even set some of Tolkien's poems to whiney music sung by people with terrible singing voices, so, like, cool. It made me want to gouge my eyeballs out and use them to plug my ears, but your mileage may vary.
As to whether any or all of the Hobbit films are the best films ever or a travesty that requires that the director be tarred and feathered and ridden out on a Grond, the actual truth is somewhere in the middle. Yes, three movies were probably excessive. No, one movie would not have done it. This is because it's not a matter of just telling the story in The Hobbit's measly 300 pages, but also giving the backstory that was in the appendicies to LotR (to which Jackson had the rights) and maybe approaching what might be a full telling of The Quest of Erebor, the story Tolkien later started to write, essentially re-writing The Hobbit to better fit into the tone and pagentry of Lord of the Rings. (Published posthumously by his son Christopher in Unfinished Tales.) Unfortunately, Jackson did not have access to Tolkien's writings other than what was in the appendicies and The Hobbit, and Christopher Tolkien absolutely refused Jackson the rights to Tolkien's other notes. So in order to make it fit with Lord of the Rings, Jackson had to make some of it up in order to not be sued by the Tolkien estate.
So, did he make stuff up that Tolkien didn't write? Of course he did. Did he make up *too much* stuff? Maybe. Did he put in too much filler? Yeah, probably. Should he have kept it to one movie and only filmed what was in The Hobbit? Absolutely not. There is more story there, (Specifically, why Gandalf felt Erebor was so important to the coming war) and Jackson told as much of it as he was allowed to. Three films *was* excessive, but to say it shouldn't be filmed because it wasn't in The Hobbit is to show ignorance about all the backstory and detail surrounding the Quest of Erebor that wasn't in what was essentially a children's book. And besides, The Hobbit was already filmed, in 1977. (I didn't like it much. It made my teeth hurt.)
Footnote, after all these years, having read the novels multiple times, once to my daughter before the films first came out, I just recently had an in-story epiphany. It always seemed curious and whimsical that Gandalf was so adamant about Bilbo being included in the quest. But think -- that simple decision set in motion a chain of events that after many years leads to the destruction of the One Ring -- something that probably could not have happened otherwise. How did Gandalf know?