Here we go again.
Bruce Lee never lost a fight but he also never won an contest, contrary to popular believes. The fighting tech he shows in his films is ok but nothing more, though one shouldn't forget that he was an actor and the main goal was to impress the audience. However, the people he used to spar with, some of them great MA themselves, cherished him and said that he was the best, or in Lebells case, the best of his time.
The only facts we know about him. He was a good actor, had an incredible physical fitness, was a great dancer

, an philosoph, great Martial Arts-tech, who was described as the best (by the only credible sources, his sparring partners), and the beginning of the modern MMA.
BTW JKD is not only about striking and kicking but also about grappling/wrestling. Bruce Lee assimilated it from Judo (Gene Lebell) and other techs, contrary to popular believes.
He is something like the (Mixed-) Martial Arts Superman. Though there were heroes before him, he started something new, something great, he became an legend and every MA out there is measured by his standard. That no one can take his place as the most famous MA is something a lot of fanboys can't accept.
There are now better techs and maybe better fighters. How good he would be in the MMA (supposed he would get the time to "catch up) doesn't really matter, because it ends only in speculation. He is dead but he will always be the first and greates modern-day MA. He deserves the respect and he earned the fame. RIP
