A very awesome manga/anime. The Manga Totally Pwns the Anime's ass, having a much more in-depth plot, more characters, more blood, more of the original story (Church Vs. Nazis), more everything than the anime could ever hold. In short, read the manga, don't watch the anime.
Guy 1- Dude, have you watched Hellsing?!
Guy 2- No, I've read the manga. Isn't the whole Nazi thing cool?
Guy 1- What nazi thing?