Finally got around to seeing the ending. I liked it. Five was kind of out-of-place in the story, but otherwise I enjoyed the show for what it was. I loved the nod to Icelandic music at the end (Arnór Dan doing the vocals on some of the OST tracks). In fact, despite the OST being heavily influenced by Icelandic music (and there being a track called von which always showed up next to the Sigur Ros track of the same name), I never connected 'Von' to the Icelandic Von. I thought it would mean something else, but overall, I liked what they did.
And that, ladies and gentlemen, is how the cookie crumbles. ��
The show seemed promising enough, but once Five was introduced and the characters stopped being developed the series suffered from any kind of progression.
They spent too much trying to have that chess game with Five for there to be any time given to the stories of the children at the orphanage. The gravity of the situation wasn't as strong because all the back story was through Shibazaki's short investigation that took place in one or two episodes.