I've never really liked Jet Li, partially because doesn't do martial arts anymore, and partially because when he did, it was mostly wuxia, which I'm not a fan of. He was an amazing martial artist, though, champion at the age of 18 or so.
People don't remember the good western martial artists, just the famous ones. They remember the Steven Seagulls, the JCVD's, the Carradines. They don't remember the Urquidez', the Norton's, the Allen's. Hell, who even remembers Dolph Lundgren? My god, what a polymath that man is.
And Kaio, I think it was just that Bruce was a) the first to really become famous outside china, and b) a pioneer of the more visceral combat that the eighties and nineties had, rather than mostly wuxia beforehand. Not that wuxia disappeared. He was also tremendously charismatic. Both on and off-screen. Also 4 films, plus two made with footage shot before his death, to differing degrees of success. Mostly no success, though. Game of Death was better than the sequel, but both shuddered with the ineptness of handling the stand ins.