I dont' know why there aren't more negative reviews about this series, but the JoJo series had been my favorite anime to watch (I don't read any manga), and this arc was a huge letdown after 3 solid, enjoyable, and often amazing arcs. The Stardust Crusader OVA from long ago got me hooked, and I was really looking forward to seeing Diamond is Unbreakable after finishing the TV series version of Stardust Crusaders.
I understand this TV series stays pretty true to the manga, but I feel that the writer Hirohiko Araki simply ran out of ideas after the EPIC Stardust Crusader arc and made this
filler arc (for the money) about nothing significant, creating characters that were hard to appreciate because they were whiny, talkative, immature, stupid, and simply lucky, in some sense, when defeating these super random unmemorable opponents with vaguely-defined abilities. I understand the characters are supposed to be young and immature, but I got tired of constantly seeing the characters suddenly act immature over and over in the middle of life-and-death situations.
I really enjoyed the JoJo series as a whole because of amazing powers and the characters having to be clever and creative in order to win, but this arc barely tries. Or perhaps the characters are so unlikable I don't care if the main characters actually lost/died.
The series brings back the main characters from the past storylines, Joseph Joestar and Jotaro Kujo, but Joseph is completely useless in this series and the reasons change from him barely having any memory and barely able to walk to being able to walk and think but having to take care of a pointless baby. I assume the baby becomes a major character in a future arc, but it's super lame how they introduced the baby and how Jonathan was completely out of commission.
If you are a hardcore fan of the series like I am, watch it just to get it over with. If you are new to the series, I highly recommend checking out the first 3 arcs over this one.