Yeah, the endin' was very sad, but the point of the story was what they were tryin' ta accomplish. And I think that they managed quite well, despite the losses, so inna way it was kind of a happy ending. They all died a Samurai's death fightin' for what they believed in, what more could they ask for.
P.S. Kikuchiyo was my fav. too, so I understand how u feel.