If there is a ranking list for the most underrated anime in history, this is top 1. People would easily overlook MyGO because 1) it's part of the Bang Dream universe 2) it's the cliche "cute high school anime girls do bands" genre 3) it's 2.5D. They are making a fatal mistake. MyGO has an insanely well-written story packed with unexpected plot twists, expressive details, and subtle emotions that very few anime, even beyond the cliche music genre, could handle. I was never a Bang Dream fan or ever a "girl band" fan, but now I have bought MyGO albums just because of this anime alone. A flawless rollercoaster experience. I can't say anything about the other Bang Dream shows but MyGO is a standalone masterpiece.
With all that being said, its final score depends on Ave Mujica, so fingers crossed.