If you're looking for some trash to watch this probably isn't the worst trash you could watch.
Story: 7
The overall story was explored well. The themes didn't make a lot of sense and the show was preachier and more overdramatic than I would've liked. Some of the backstories were interesting to go into, but I never got a sense of satisfaction after learning something new about a character. There was also no sense of completion by the end of the series. Things sort of developed how you knew they would and you expect more.
Art: 7
The art is decent, but the world design is way better than the actual character design.
Sound: 7
Didn't leave a lasting impression. Wasn't bad, but wasn't great. The show only gets bonus points for its OP and ED.
Characters: 4
They at least had the sense to give the characters goals and personalities, but not only did some of them make no sense and others didn't even need to be in the anime for the plot to progress, but I didn't actually like any of them. Like none. None of these characters are likable people. Maybe Kaname, and some of the side characters who show up sometimes. But even he is more tolerable than likable.
Enjoyment: 7
Despite being objectively a trash-fest, the show as a journey is quite enjoyable, and a decent binge. I wouldn't really recommend it though. There's a lot better out there than this.
Overall: 6
Again, this isn't the worst thing you could watch, but it's not great. It's barely good. It doesn't really have a message to convey properly. The passage of time is a consistent theme, and looking back through the history of the Shioshishio was interesting, but ultimately was shoehorned in. Most of the interesting characters were not members of the main cast.
I wouldn't recommend the show, but it's not that bad.