I have been a martial artist for many years and, not that it makes my opinion anymore fact that anyone elses, but I have trained with a few of the people some of you are talking about. As far as Bruce Lee, I agree with the majority in that he wouldn't be able to handle some of the MMA fighters that are out there today. But Bruce wasn't famous because he was necessarily the best fighter, he was famous for revolutionizing the way many people thought about martial arts. He didn't worry about tradition, and he developed what he thought was the most efficient fighting technique. His strength was not exaggerated though.
<< Jesse Glover - "Bruce would take hold of a 70lb dumbbell with one arm and raise it to a lateral position, level to his shoulder and then he'd hold the contraction for a few seconds. Nobody else I knew could even get it up there, let it alone hold it up there". >>
You can find many, many quotes like these from former students/training partners. He could measure up pound for pound with anyone.
As far as Steven Seagul, he is/was the real deal. Although I don't know much about what he is doing nowadays, I had an opportunity to learn from him one afternoon as he was a guest in our Dojo. He was very generous and seemed extremely genuine as well. The fact that he reached 7th Dan in Aikido in Japan, and opened a school there, pretty much speaks for itself. A Westerner able to do that, and prosper, must be quite good at what he does. Most of the complaints I've heard of him regarding his movies, are that he can be a little reckless when it comes to his co-actor's safety. Although I myself would have a hard time believing it because I've worked with him, it's fairly hard to fake some of the more painful moves. In anycase, just my $0.02 =)
-monotony-