Most of the other positive reviews say the things I loved about this show; well thought-out plot, great soundtrack, etc. Personally, I especially loved the mix of deep philosophical discussions (Malcolm and Kokoro) with pretty brutal action.
Something I haven't seen anyone else comment on is that from a thematic standpoint, this series has a lot of the same themes as Humans, which is one of my favorite shows. Anyone disappointed that Humans wasn't finished will love this series.