Sammo is a legend! It always struck me as a real shame that he's never had the recognition that others in Asian cinema have...Jackie Chan and Jet Li, to name just two. His martial arts skill is far and above that of Jet Li, but I suppose he doesn't have the looks to pull off that kind of stardom.
His fight choreography is awesome in early kung fu films like "When Taekwondo Strikes" and many others. Some of my favourite early Sammo films are Enter the Fat Dragon, Warriors Two, Magnificent Butcher. He was also in Enter the Dragon which wins him extra points from me
I've seen stacks of his films - but I believe he's been in 80 or so, so I still have several to see.