I've listened to (and occasionally played) a lot of really mediocre classical music, and this sounded exactly to me like "lesser composer tried to mimic Beethoven" and/or "sketches completed by his student". Or, alternately, "great composer phoned it in", of which Beethoven's "Wellington's Victory" is a relevant example. The AI totally nailed the sound of Beethoven, the rhythms, harmonies, and orchestration... but my reaction is the same as yours. Fine for listening to in the background while I code, I guess.

On the other hand, I'm now very curious what similar experiments with other composers would sound like: Vivaldi, Brahms, Shostakovich, Philip Glass, John Williams.... the potential for AI orchestration is probably infinite.