I had the same impression for DMmd, I guess it's because it's from a game but it seems like the story isn't quite complete. there is an end and a final but there are still questions without answers and that's kinda anoying...
that's too bad ...
Tee art was really good and reminded me of a game (on purpose i supose) so it fit the story well. about the story except the anyoying fact that you don't know all of it, it's quite original and that's what i liked the best (even if I put a 6 at it but it REALLY is anoying)
I liked the music a lot the ending and opening were in the "mood" or "theme" of the anime.
oh and at some point I didin't really want to see all the episode because it was a bit out, i mean no information untill last episodes.... it's harsh.... happilly it was only 12 episode even if i think it was a bit to short...
(sorry for the bad english)
