So where to begin,
Concept is good, but story is weak. It could be far better. I believe that only the comical part of this anime worth something, and i really can say that it was worth to watch just because of comedy in it (it could be more humor but its fine),
Art, very good, it is nicely done, the IS itself were nicely designed, although if i must guess that technology is nano technology, in real life no chance these suits could do what was shown in anime (who knows), sound is good, it could be better but il stay on this
Characters,, i love characters in IS, they are all fine and funny on its own way, enjoyment and overall, i would love to give 10 to this anime but it deserve max of 8 points, simply there is things that could definitly be better, like story,
but eight is not bad score at all,