warning: spoilers.

The series started out good, but then it got out of control. After a while it lacked so much believability that it stopped being fun to watch. There is bad logic and plot holes, and there were a lot of bad physics situations. Such things as violations of matter and energy conservation (endless supplies of energy and creating matter from nothing); a small mecha defeating something 50 times its size in a head on collision; a man with a 1 foot diameter hole in his chest still standing and talking; a society that has less than 1 million people goes from barely surviving underground and obviously lacking in modern technology to going to the surface and suddenly in 7 years being so ultra modern that it surpasses what we have and having built a huge luxurious city with flying vehicles and whatnot; also in that 7 years somehow they developed the technology to make a bio computer - one that integrates the mechanical parts of a computer and a human head; movements both in air and in space are not what would happen; protagonist comes up with magnificent moves on the spot and the mecha somehow does them even though there was no way the protagonist could know that the mecha could do such things; how is it that one spiral mecha can so easily defeat the enemy, but somehow in the past when we were more numerous and had more mechas were unable to defeat the enemy? If humans were originally defeated but some remained, why would the conquerers (who feared humans) leave the chance of humans coming back instead of just destroying the planet?

So as I said, lacks believability. (show less)