bruce lee is a martial arts legend for a reason. he had unbelievable power not to mention his speed.
i think he is one of the greatest strikers ever. world class MAists said he was incredible in any aspect. he was highly intelligent and surely very tough although he never proved his toughness in any combat sport. nobody knows ho good his opponents on the street really were. its only speculation. but when you look at his movements in his films and you have an eye to recognize true skills there is nobody who can say he wasnt great as a full contact fighter. ell youre right he would be chanceless in the mma octagon, especially fighting a big heavyweight like lesnar. but if he fought a guy like lesnar on the street, whos tough and skilled also i would put all my money on that lee would beat him with ease and kill him if necessary. he was just too fast and if he hits you once it should be over because of his precision and power. the main thing was that he always fought as easy, direct and efficient as possible, he wouldnt try to kick someones head on the street, he definitely would kick his nuts, grap his eyes, and dont use "good looking" moves. he was great and there was no fighter at his time being able to beat him in a fight with no rules i believe.
excuse my english, im german