Alex Rodriguez and Barry Bonds were "clean" too...
UFC has busted some of its stars before, Sean Sherk lost his title b/c he tested positive for roids, so it is legit. I'm not saying its beyond the realm of possibility that Brock is on the juice, but I just think he is one of those naturally big country boys from out in the sticks in Minnesota. He has said he has to cut weight to make the 265 limit that he normally walks around at 300+.
I did think that Lesnar would get the best of Mir this time (and predicted as much a few months back), as he was kicking his ass last time before being caught in a submission. This one wasn't the prettiest fight, all ground and pound, but Brock is a mountain and you have to play the cards you have. Bring on Fedor and you set all time PPV records.
My favorite fight was the Dan Henderson/Micheal Bipsping, and I loved that Dan knocked him silly. I never liked Bipsping after he lost to the deaf guy, but the judges gave him the decision anyway, and he had the nerve to talk smack. I always thought he was overrated to get the UK crowd interested in UFC, and now it's proven.