Animation:
The animation of this movie can't exactly be compared to many other animes out there. This movie was likely strongly limited by thejr lack of locations. With 90% of the movie showing a single place, a stadium. But even with that, each scene looks great. Many animes suffer from deadlines hindering how much detail they can add. But since it came out as an movie, they had more time to work on those things. Most of the scenes look great, and the animation absolutely adds to the emotions of each scene.
Plot:
I was on the edge of my seat for the whole show. I even had to sit up from the theatre's reclined seating. There's plenty of tension in the story, and the stakes feel high. While I did safely expect the protagonists to win, the story keeps you engaged. Every moment I was wanting more! There was so much symbolism and scenes with figurative language that I would love to spoil, but I want more people to see this review and watch the movie with zero spoilers. However, both me and my friend were locked in. I was afraid to blink. The pacing was excellent and there wasn't a moment where I was going 'hurry up and get back to the good stuff'.
Music:
It was hard for me to judge the music throughout the movie without distracting myself from the action, but they do use it well. There is one scene in particular, where the music is used so amazingly to drive the stakes up.
Characters:
If there are any characters you already love from Haikyuu, especially if they're from Karasuno (Hinata) or Nekoma (Kenma), you will love them even more. I do think they could've given a little more time to some of the other characters.
Other:
I wish I could rewatch it again for the first time, and it's great to go with friends.
You ABSOLUTELY will enjoy it a thousand times better if you have prior knowledge (atleast watch the anime first) before seeing this movie. I can imagine that it would be difficult to enjoy if you have no prior experience.