>>5123858guess I wasn't the only one too who thought the same, and I say this as a hoshiyomi
the song choice actually fits them if you consider the lyrics, but Suisei sounds she's struggling more than usual on the high notes. While she has always had issues with them, it feels like it's more noticeable here, perhaps due to how the song actually doesn't fit her voice since it's a song that sort of goes against her power. There's actually a fair amount of vocaloid songs that both sound great and actually match her voice
like Angelfish and while I personally feel she could use a better suited song, she and Mori did her best
about people not liking the song itself, I agree it's not for everyone but it really comes down to personal taste