The characters are interesting, some are even surprisingly likable when I would expect to hate them. The episodes vary widely in scope and even genre. At times I was not really interested in some of the individual episodes like the urban legends themed one or the interrogation. At other times I was a little lost by the somewhat abstract story telling in the middle of the series. Keeping characters straight was momentarily difficult. Some episodes were expert examples of controlling the audience, such as the episode in which the trio of suicide website members meet up. I loved that episode. Even there though, the suicide websites were a very Japanese issue.
Overall the themes of the anime seem to be about Japan's past war crimes, and the the refusal to take responsibility by playing the victim. There are many nods to WWII and reconstruction era Japan. The atomic bomb in the start of the series, the detectives fantasy and notations to the rising sun, or when he literally says that destroyed Tokyo looks like post-war Japan.
Still, the themes of playing the victim or relying on being victimized to escape your past is something that extends past that to something we can all relate to. They're pressing issues today. There are also critiques of consumerism/capitalism, and relying on 'wholesome' or 'cute' or 'kawaii' (or moeblob, waifus) to step away from your problems that are pertinent today. The Isekai genre still contains many of the things that one might socially critique the old cute girls do cute things genre for socially. It takes jabs at Otaku and anime fans in general which are still on point to this day at times.
Overall the anime remains a very memorable and unique experience that has depth to it that few others do. For me, I prefer when the depth isn't almost entirely constrained to symbolism. None the less, the whole thing is a ride which I enjoyed watching. I hope the people watching on Toonami have a good experience as well, it was what spurred my own rewatch.
