Getter Robo Arc is a faithful adaptation of the manga by the same name. The animations isn't that great but the show deserves a chance. It tells the story of humans and dinosaur people working together to fight an alien civilization to save the Earth but one of them realized that they can't co-exist as long as Getter posing a threat to the entire universe. Pros: - Faithful to the manga - The added backstory and lore segments were nice, which weren't in the manga - Black Shin Tarak and the new getters that appeared were hype as fuck - Seeing animated segments from Go and Shin mangas were great - Using oldsongs is a nostalgia ride
- (Hopefully) revived the interest of Getter Robo and classic mecha genre so we might get more anime in the future
- Overall fun to watch

Cons:
- You need to read 4 mangas (Getter Robo, GR G, GR Go, Shin GR) before watching this (5 if you include its base material, Getter Arc manga) so it's not accessible for newcomers
- Some characters didn't get much story and development
- left too much for desire. e.g a certain Getter appeared again but we still don't to know much about it
- We didn't get to see the climax of the battle that happened in the end of the manga. the ending got abrupted in both the manga and the anime for some reason.
- The animation is rough and really terrible in some scenes but It was manageable to watch
- The ending will leave you with so many questions but maybe it's for a 2nd season

Overall: 8/10
It's a treat for Getter fans (especially the manga readers). Those however who only watched the 70s shows or the OVAs might be either super confused or disappointed as Arc have different art and style.

If you are new to getter, then most likely you won't be able to enjoy this. If it still tickles your interest, read the mangas then watch Getter Arc.