I've just finished watching the entire series. Wow! An extended, serialized experimental film!
The artwork is a bit challenging and kinda confusing at times. The use of colour is stunning!
It was a little tricky figuring out who was in what body from episode to episode.
The mix of "real" and "virtual" was pretty bizarre.
I really like the artwork and music of the opening and closing sequences.
There are so many details in plot and artwork that I think it'll take a few viewings to more fully appreciate.
The last several episodes kinda tie things together, but they're kinda convoluted, both in sequencing and in references to previous episodes.
Overall, I think Kaiba is a very interesting experience that is unique and otherworldly. It's definitely not aimed at children... not because of the bits of sex here and there, but because there are some pretty heavy themes and some fairy convoluted plot lines.