I would like to take this opportunity to express the following
caustic opinion:
Rurouni Kenshin is what
Ninja Scroll wishes it were in its
wildest wet
dreams.
Kenshin has a great anti-hero whose skills make sense (if not in terms of physics, then at least terms of plot).
Kenshin has interesting supporting characters. And interesting bad guys. And is set in an interesting historical period (the Meiji Restoration).
The main themes of "Kenshin," which set it apart from its lesser bretheren (the aforementioned Ninja Scroll, Dragonball Z) are love, redemption, the morality of killing, and the subsuming of the samurai way to European modernity. It has weaknesses; a fetishization of strange sword techniques, romantic attractions that take way too long to play out, and storytelling that is not, perhaps, economical, but overall it's an entertaining anime, especially if you can groove on the sword fights. I don't really care, but then I wouldn't.
Also, Kenshin has great music.