MMA dont have the stamina,punching power or speed of a boxer of the same weight and some boxers have been known to knock an opponent out who is far heavier. Imagine a Mike Tyson in his prime in a MMA tournament,Tank Abbott made it look easy with just his two fists and no martial arts training at all. I would like to know how a person would go about grappling Lennox Lewis to the floor and imagine the same boxer sat on top of someone punching him to the head and body....he would probably kill him. Put someone who is an expert at boxing or any other discipline in a MMA arena and they dont look effective.Put an expert MMA in a different enviroment with different rules and he too would fail to impress. MMA is very good in a competition where taking the best bits from different martial arts is a winning formula.A MMA would suck in a boxing ring or an Aikido dojo where they had to abide by the rules of the gym or dojo. We cannot say a MMA would beat a boxer in a street fight either since it would depend on the two people taking part. You would have to take into concideration the size of the two people involved and thier fitness but more importantly the violence factor.Some people will use any means at all even if it means killing the other person and others wont.Its a case of how far your willing to take it in a street confrontation. 9/10 people will always back down but that means you then have to fight the tenth man everytime so how far would you as an individual be willing to go. To some people reputation is more important than thier family and those very same people are willing to do jail time for the privilage of having a fearsome rep.