In the originality category, Gilgamesh certainly does extremely well, as it certainly sets forth a very intriguing world with interesting constraints and attributes in which its characters can interact. The plot and plot development are also excellent, though as noted above, the ending seems to simply sweep so many of the possibilities aside and really squander much of the setup done in the episodes leading up to the final confrontation.

The story also has a slight hint of incest to it. Certain scenes, especially, stand out as such if taken completely out of context. Also, throughout the series Tatsuya is suspected of having a sister complex. This element may be considered by some as being gratuitous and may easily sour for some what would otherwise be very compelling characters.