Bullshit. These movies did a better job with 13 dwarves than most would have. Other depictions of The Hobbit that I've seen, like that shitty 1977 cartoon or the 2003 game, did little to differentiate between the dwarves, much less give them character.
In this version, about half of them have some sort of character development, and most of the rest at least have something that makes them stand out, even if it is only a visual gag. No, not every dwarf is a deep and meaningful character, but you know what? That was never going to happen no matter who made this movie. Considering the source material, they went above and beyond with the dwarves.
The problem is, you're comparing the characterizations of the Dwarves in the movie to those of the book, cartoon, and game - their characterizations in those other mediums aren't very complex so the film version, where things are slightly more developed, must be good. But the characters in the film version are still thin as a sheet of paper and not memorable in the least.
"The fat one", "The bald one", "The one with the weird mustache", etc. are vague descriptors of their appearances and nothing more. They're not personality traits, they tell us nothing about who they are as people. None of that makes them likable or interesting and none of that makes up for giving them actual screen time and dialog.
The core of the story is the journey of Bilbo and the Dwarves, and their interactions with each other, but in the film adaptations this is shelved (primarily in the second and third parts) in favor of MORE - more Gandalf, more Sauron, more Galadriel, more Bard, more Laketown, and more Elves, not to mention the creation of several superfluous characters such as Tauriel, Azog, and Alfrid. They added in tons and tons and tons and tons of dumb shit and the core story and the core cast of characters unquestionably suffered because of it.
There could have been a version of this movie(s) where the director was actually interested in telling a coherent story with a recognizable, likable, and compelling cast of characters. This wasn't it.
Tolkien's own lack of effort to build up the company in the book itself isn't a good excuse for Jackson not doing it, especially when stretching the book out into three lengthy films.
Bingo.