Rurouni kenshin tells the story of a sowrdsman (not a samurai) who doesn't want to kill any more. Thel context lets you understand more about the history of japan, since the historical facts are very well explained (sometimes the problen is to difference facts and fantasy, anyway).
This manga will keep you entertained from the begining to the end, being very dynamic and quick (not "That" quick, but quick enough).
It's onl weakness are some minor characters, who sometimes don't really fit in an hitorical manga.
Finally, Rurouni Kenshin has a plausible end, not like the anime, allowing you to declare satisfied once you finish reading.