I didn't expect to be disappointed, but damn this hurts. I don't understand the reason for this blunder, Hibike Euphonium 1&2 and Liz and the Blue Bird did it right, then they decided to rush the 3rd movie.
3rd years got replaced by 1st years as expected and the newcomers ended up having some issues that needed to be worked out. In addition there was some romance involved, a bit of existential crysis. Issue is that this should've been another season with 13 episodes, not a movie. Every storyline got rushed or outright neglected and forgotten, timeskips are painfully noticable. I still can't believe that the entire 2nd year is over, 1/3rd of high school was basically fit into 1 hour and 40 minutes (including credits).
Most of the drama would've worked just like before if it wasn't for the unprompted speedrun. It's only the euph players' drama that was pretty predictable, other than that I was keen on following all the storylines. We got a little bit of everything, but it was only enough to scratched the surface in each storyline. I'm so mad that the new 3rd years didn't even get a proper goodbye, maybe it will be addressed in a sequel, but I doubt that.
There are a few CGI shots that painfully stand out, most notably during the final performance. Once again just rushed.
Unfortunately you can't skip this, afterall this speedruns the 2nd year and you'd be missing out on a lot of information. This is a compilation movie of something that doesn't exist. They can do better than this.