I kinda enjoy this anime. It mainly because I like superpower, they present it nicely here through the various battle scenes, though some of them kinda lame because they're too one-sided. There are humors in character interactions, some of them are sexual (if that's your thing). I find that's rather out of place though, considering the serious atmosphere this anime constantly gives. There are also some things that I dislike here, like the terrible plot, events are so random that it left plot holes. The simpleness of characters will bore you or even annoy you.
Story: decent but not interesting enough
Art: nothing special, too much blood and gore which I dislike
Sound: bad, always skip op and ed, soundtracks are too weird for my taste
Character: I don't dislike MC, or his beloved sister. but I really sick of the woman MC. Another support characters is boring, except for Iyo, I love her. Don't mind the people in the universe, they're just mindless idiots.
Overall: watch it for shounen or action show, don't expect good plot or character development whatsoever.