This will make a lot of Bruce Lee fans hate me, but reality is what it is. Compare how he looks here, during actual practice (with an opponent who doesn't even attack him) with his movies. Yes, he was fast. Yes, he was superbly trained and fit, etc. with great coordination skills - but this video really doesn't exactly instill awe in a careful observer:
Now, compare that to the video just below. You be the judge.