While I think the hobbit movies were very bad, I've never agreed with this take. Mostly the movies pull details out of the lord of the rings appendixes and fill in gaps in the plot of the hobbit that would honestly be quite strange in a modern film. Gandalf just screwing off for no apparent reason for half the film would be confusing and weird (honestly it was in the book too, but it's too whimsical to be a bother). And a lot of people complained about Legolas being there but other people would complain if he wasn't, or if he was just a no name member of the mob like the elves were in the book.

There's nothing inherently wrong with an adapted version of the hobbit that fits in better to lord of the rings imo, it's just that this particular try at it was a disaster.