Yes, your lack of research on Bruce Lee is obvious. You are right that there isn't really any footage of him fighting. Only his movies which are intended for entertainment btw. Despite his lack of fight record you would be hard pressed to find a professional MMA fighter who has something negative to say about Bruce Lee, because he is considered to be one of the founding fathers of the modern MMA movement(along with others like Gene Lebell who was Lee's grappling and wrestling instructor btw). He didn't just know striking techniques, he praised the use of grappling and take downs and has said that in order to be a full well rounded fighter you had to sample other styles. Sounds like common sense today but at the time that was pretty revolutionary and unheard of in the mainstream martial arts world.I will pad it out a little though. I see a Bruce Lee demo and it looks like a theater production and I see his movies and think "OMG! Why does he screech like a *****? Why is there a sound a sound effect played every time hits a person, like somebody is slapping a dead pig?" and I have never heard of him in a match.
Shit, I've seen Michael Jai White and he looks more impressive than anything I've seen Bruce Lee do.
He and Chuck Norris are VERY over rated to me, though I haven't seriously researched them.
I agree that any MMA fighter today can take him out, much in the same way any modern physicist can run circles around Isaac Newton if both were to materialize in the present exactly as they were in the past. Things have changed and knowledge has advanced, but lets not forget the people who help pave the way and help inspire a whole generation to take an interest in their respective art. Especially since I'm sure Lee(and Newton) given enough time to train and catch up can probably teach us all some new things.