This is a trend in "final chapter" that I could do with coming to an end sooner rather than later. It seems to have become popular ever since Harry Potter and the Deathly Hallows. The thing is, with HP it made sense. With HP, the model of 1 book = 1 film was already becoming strained with installments five and six. The final novel just had way too much going on spread out over too many pages to fit everything into a single film without stretching it into a 3.5 hour epic - something that would have killed it in the box office.
Then Twilight decided it needed to split the final book, even though the entire trilogy could probably have been done in only two movies. Going 1:1 is understandable. Splitting the final one was nothing more than tring to milk the patrons.
The Hobbit should probably have been 2 films each about 3 hours long, the way they had originally been planned. This would have cut almost 1.5 hours and would have avoided all the blowback from "stretching filler too far". Personally, I enjoyed all three films, but I can understand some of the resentment to having three.
The Hunger Games has bothered me since the second movie. I was actually pleasantly surprised by the first movie. It was better than I had expected b a fair margin. The second movie felt very much like it was suffering a bit too much in its role as merely a set-up for the third film. Yes, that is the nature of middle installments, but that doesn't mean that middle installments need to be devoid of their own merits. The Empire Strikes Back demonstrated that beautifully. I think the so-so installment that was Catching Fire is part of what led to Mockingjay Part 1 being such a disappointment. Catching Fire was little more than establishing the new rules for Mockingjay, but served little other purpose. That means the next part needs to start delivering on the setup. The opening scene actually does deliver a sense that something dire is happening, but then it is almost immediately shown to be little more than manufactured angst. The film never delivers on the second movie's work of creating a bridge, basically making the second movie almost as pointless as the third. At this point, I have real reservations that the final part can possibly deliver enough payoff to justify essentially having what is now two installments in a row that serve no internal purpose, but only serve the arc.