I find it ironic that

Pretty much every scene with Katniss whining turned out too long. It is one thing to establish what her character is going through but another to repeat it over and over again. She was so strong in the past movies and now she is on the brink of breaking down every few minutes?

The movie is just not sure what story it wants to tell. It is heading nowhere and feels like they picked up the fragments which they could not fit into the last movie and just stuck them together. Getting Peeta back is not really the end of the movies arc, nor is the start of the rebellion. Splitting the movie would have been possible had they broken the story down in a more reasonable way. But it seems that they put all the juicy stuff into the last movie and kept this for a mere whining excercise, using "character development" as a fig leaf, when in fact there is no development at all.

The lack of smart writing does not help either. Everything is spelled out. The characters frequently act like morons. But a slow movie has to be a smart movie, as the little things matter more. It needs little ideas of people just being a bit wittier than the audience.

Even when it comes to the action, the movie is more interested in creating easily readable scenes than keeping up its reality. There might be military tactics which sound good when written, but they look pointless when filmed, like climbing up trees under fire or full frontal attacks without weapons. Could show desperation, but looks moronic when shown the way this movie does it. There is just this little bit extra missing which the previous movies had: the screenwriter wondering what he would do in that situation and allow the characters to adapt accordingly. Some clever self-made weapons. Some tactics utilizing their strengths against the oppressor and therefore playing out their culture against the brute force, like Katniss did it on a smaller level. But instead the winner is just who fights harder. There is no storytelling in the action.