I absolutely loved the movie, but I do agree, Samael is kind of a week character. I was also expecting the grand forces of evil to be much more sinister/hellish, and much less "Final Fantasy: The Spirits Within". Kroenen and Rasputin, along with Ilsa (DAMN those were some tight pants at the end of the movie), kicked about 9 or 10 different levels of ass, especially Kroened. The Hero side was well rounded as well.
Definitely enjoyed it though, and want to see it again. Hopefully we can get a sequel, sans squid demons.