I liked the animation despite it heavily relying on CGI effects, it's nice and fluid even though it takes a bit to adapt to.
As for the story/plot, I found it somewhat underwhelming and felt the need to fast-forward some tedious moments. Honestly, the main baddie [spoiler], Sato-san,[/spoiler] is very boring throughout both seasons. And although it had potential for a 3rd season, the ending of the 2nd season clearly showed you that it was planned to continue into a 3rd one by following the exact same formula and focusing on the exact same enemy as S1 and S2 - it was doomed to fail even if it wasn't canceled beforehand.

Another thing that I took issue with, which is related to the ending of S2; [spoiler]Ajins are immortal beings, but somewhere along the show it is implied that they aren't actually immortal in the sense that if you cut away one of their limbs it grows back... the logic that follows is that if you cut an Ajin's head then the head that grows back into the body will have a blank brain with different neural composition, and thus won't be the same person/ego. In the ending of S2, Sato-san, "the baddie", is decapitated and then... he remembers everything and retains his self, contradicting the entire idea created by himself that decapitation was the equivalent of death for an Ajin; it's stupid that the threat loomed for the entire show and is thrown out the window at the last minute of S2. Anyway, I guess that there's still the looming threat of a plastic bag over an Ajin's head, quite literally.[/spoiler]