I had never heard the term "set-up movie" before today. There has definitely been a trend of splitting up a story into multiple movies. These movies don't have a beginning-middle-end the same way other movies do but at the very least there's some progress.
The problem with the Mockingjay Pt 1 is not that it's boring or poorly made. In fact, there is a lot of excitement in this movie. The problem is that from beginning to end there is hardly anything that changes. If you look at where the characters are in the beginning and where they are in the end there isn't much that's changed except for what happens in the very end. Katniss has been doing things but we haven't seen much of the effects of her actions.
I didn't dislike this movie that much despite it's slow beginning. I just can't give this my seal of approval when I left the theater feeling like I saw half a movie. By the time the story gets its payoff my memory of this movie will be worn-off.