For being the basis on which the Blood+ universe was created, it has atmospheric animation and creative monster design. However, there are many ideas that are introduced and yet fail to be fleshed out. I look at it as a very bare-bones first draft, because in the end, there is still very little understood about the main character and why she is the way that she is, or how she came to start on this mission, or what her connection is to this agency she's a part of. It's best enjoyed as an experimental pilot into the Blood universe, where Blood+, although very different, takes those ideas and presents them much more cohesively and adds more dimension to the characters.