This series gained notoriety when it came out in Japan due to the unbelievable amount of censorship that was applied to episodes. Massive black circles would cover huge parts of the screen to block almost anything what was violent. The feedback was that the show was literally unwatchable this way and the series was a complete disaster with this incarnation. The series would soon find its way to CrunchyRoll in a completely uncensored form and, while it does have some novel ways it uses the high level of ultra violence in the show, the writing is just awful and this really is one of the worst sci-fi shows I have ever seen.
The plot makes no sense. Bug people have taken over Mars and are now going to come to Earth to kill humans. No weapons can harm them so Earth merges high-level human fighters with various bugs that has a 50% chance of death when done. These bug fighters are now on the way to Mars to kill the Bug people before they come destroy earth.
The story makes no sense. If guns and other weapons do not work, why not create Terminator like robots to destroy these bug people? It makes no sense that the earth bug people would somehow be stronger than killer robots would be, it is physically impossible for any type of hybrid bug fighter to be more powerful than a fleet of killing machine robots.
Either way, lets remove that plot hole, the series writing is awful. No characters are likable, the weird announcer makes the series seem like some 1980's Ultraman drek, and it just fails to be anything than a gore-porn crapshow.
Strong recommendation to avoid, 3/10.