It's missing the point of said criticism, whether you agree with it or not. The original finale of Breaking Bad heavily implied Jesse got out of the whole deal scarred and beaten up, but alive and as a free man. He may be alone, traumatized, but at least he isn't dead or in prison like so many other people in the story. This was a 120 minutes adventure where Jesse went from being a lonely free man riding in a car to... being a lonely free man riding in a car in a different state. In both cases he's a wanted man, but of course there's less chances of him being caught over there.
That's why some people say it was unnecessary. It's a 2 hour explanation of something that was heavily implied in the original run, and the story brought Jesse to a place where 99% of the fans expected him to end anyway. The added flashbacks about the torture he went through wasn't particularly revealing either: we knew Todd is a sociopath, we knew the nazis are evil fucks who enjoy fucking around with him and so on. The only potentially not so obvious element was how supportive his friends were after Jesse disappearing for so long and his shenanigans throwing them in bigger trouble. But nothing we saw in BB suggests their friendship was ever in jeopardy, so that was still a fairly safe assumption to make ultimately.
You can love or hate the movie, but it really is hard to deny the movie was a very predictable epilogue that brought Jesse down a path that most people already assumed. It was rather obvious that he would at first get his money back, then go to the only person the entire series has known for disappearing, and then indeed doing so. Easily the most predictable thing in the Breaking Bad franchise so far, except maybe for Walt's end (given his condition since episode 1 it was rather obvious he wasn't getting out alive of this series).
