I have rated the main series a 10, and the OVA, the 2018 movie and this 2020 movie a 6. (The 2020 movie feels less like filler compared to the other two, and I am willing to rate it a 7 instead of a 6.)
The 2020 is 'bad'. There are different things I can mention that are bad. For example: the side stories aren't compelling and don't contribute to Violet's personal growth. The 'main plot' seems kind of cliche and not compelling either. I felt bored. Another example: there are many repeated flashback scenes straight from the main series, and some flashbacks are even repeated multiple times in the movie.
The movie provides closure to some plot points from the main series. I feel like that closure isn't needed. And that it isn't provided in a (very) satisfying way in this movie anyway.
The 2020 is 'bad'. There are different things I can mention that are bad. For example: the side stories aren't compelling and don't contribute to Violet's personal growth. The 'main plot' seems kind of cliche and not compelling either. I felt bored. Another example: there are many repeated flashback scenes straight from the main series, and some flashbacks are even repeated multiple times in the movie.
The movie provides closure to some plot points from the main series. I feel like that closure isn't needed. And that it isn't provided in a (very) satisfying way in this movie anyway.