The art in the show has a nostalgic style, with retro character designs. For the most part, this show seems like it could've been made in the '70s, but the battle scenes are ridiculously detailed and serious that you know it was done on purpose for laughs, and find it funny.
OP/ED are also designed to be funny, with OP having obviously outdated tune that was popular in the '70s anime songs, with matching voice that was far too serious for the series. The ED has an absurdly inappropriate lyric that keeps repeating "someday we'll all drop dead" in a song sang in lullaby style.
The voice acting was excellent, with all the character sounding very unique, yet fits perfectly for each role. The biggest surprise was the guest appearance of Nozawa Masako (who also went on to voice Gokuu in 'DBZ' and Doraemon) and Sakai Sumie, the seiyuu for Enma and Yukiko in the original series in final episode.
'Dororon Enma-kun Meeramera' is one of the few anime series that successfully pulled off "so bad it's actually good" because it pokes fun at the '70s in every single aspect of the anime, which is essentially making fun of itself.
Final episode was truly epic, with plenty of seizure-inducing visual troll going on. But on the other hand, brings closure to the story while solving all the unexplained plot devices, and makes good use of opening narration for every single episode "I will never forget the heroes who came from Hell."
The story also makes reference to many '70s events such as the Osaka Expo and the Vietnam War. This makes it a very difficult series for most viewers, since it is based on a kids show, but kids today won't possibly get the references. The art style has the retro feel, but older viewers may be turned off by excessive ecchi and 'Crayon Shin-chan' level jokes. 'Dororon Enma-kun Meeramera' is a very very niche anime that 90% of you will not enjoy, but it's a gem for those who actually "get it". In terms of retro gag anime, this is as good as it gets.
