Before you watch this, it's crucial that you watch every main line Universal Century series before this chronologically. It makes references to, and expects you to know most of the history that takes place up until this point. Its important so you can understand the Earth Federation and Mafty's goals.
That being said, I believe this movie is almost perfect for any Universal Century fan. However, if you're going into this expecting a ton of large scale mobile suit fights, you're going to be disappointed. Not to say that the movie is worse off without them though, since the movie is first and foremost a political thriller, it just isn't as action packed as NT or CCA. But when there is a fight scene, it is off the walls insane. The first mobile suit fight takes place in a city, and the movie does a phenomenal job showing the destruction and terror coming from the fight, as beams melt entire buildings and thrusters scorch streets.
The story is one of my personal favorites as they spend a ton of time exploring each character's motivations and how they interact with others. You see how, despite their actions, Mafty does care about the freedom of the people living on earth, and how the Earth Federation is working to actively suppress the civilians living in EFF occupied cities.
I feel like writing wouldn't do justice to the visuals. If you've seen the trailers you know how gorgeous this film is. What I wasn't expecting though, was how well the 2D and 3D animation worked together.
The main problems I had with the film were about the dialogue and pacing. It may have just been the netflix translation, but a lot of the dialogue was very awkward and didn't include the nuance I would have expected from this. The pacing was a little strange during some of the earlier parts of the movie, but it wasn't enough to really take me out of the experience.
If you want to watch a Gundam film exploring in-depth the Universal Century post CCA, this film is for you. If you're expecting an action packed story about the armed conflict between the Earth Federation and Mafty, you might end up disappointed.