If you're an Olympic Gold Medalist that pretty much tells the story of being a great boxer. Tyson was not a master boxer. When did you see Mike Tyson clearly outbox someone? He didn't. He used his power and speed to KO someone. If you could take Mike's shots and take him into later rounds he would drown. Ala Mr. Douglas.
Come on now, there is a bit more to the story than that. Buster Douglas was about a 40 to 1 underdog to Tyson. That was one time the men who calculate the odds got it wrong, I knew it and I bet on Douglas. Tyson's style and performance were deteriorating with every fight. It was common knowledge, and well reported, that when he was in Japan he spent more time ****ing Japanese girls than training. Douglas had a bit of talent and I new an upset was coming sooner or later. It was close, but Douglas managed to pull it off. Off course I wouldn't generally recommend betting against Tyson. That was just one unique situation from which no valid generalizations can be made.
Clay-Bey was no slouch as an amateur, or for that matter a pro. He started boxing late as a way to lose weight and was too good to stop. He was slick, had very fast hands for his size and power when he sat down to punch. He started too late as a pro to make a serious run, and never really took boxing as a life commitment. Still, a very fun fighter to watch if you like watching skilled heavyweights. Even his later fights where he's out of shape are interesting because he's so crafty in the ring. If you want to watch a war, check out his fight with Etienne. One of the best heavyweight fights of the 2000's so far.