He can certainly thump people and I have found his flicks reasonably entertaining but far from unmissable when they have appeared on TV.
My girlfriend tells me that she read somewhere that a lot of stunt men avoid working with him, because he has injured a few. A lot of crap gets written in magazines, so I hope it is not true.
I think that the American actors Steven Segal, Bruce Lee and Chuck Norris were all former martial arts people, who made entertaining films. It must help with the publicity, but it makes more sense to make martial arts films with dancers rather than real martial arts people. A real fight is usually short and ugly. Many laymen would not even understand the result, because the weapons - fists, heels of hands, elbows, knees etc would move very fast over a distance of the minimum number of centimetres. In a film you want something much longer and more aesthetically satisfying. It is also important that the audience sees everything clearly to understand it. That is what dancers are good at and it makes more sense to use them - like David Carradine or Choo Keng (now known better as "Michelle Yeoh").