Its difficult to say really. I'm a huge Tyson fan, but he tends to be overrated somewhat. I disagree with those that say he was past his prime when he lost to Douglas, he didn't take the fight seriously and barely trained for it. I think he would steam through any of today's heavyweights when he was at his best, because although his opposition wasn't the strongest, he was the closest i've seen to an invincible fighter, it just didn't seemlike it was possible to beat him to me. In terms of achievement i wouldn't say he's one of the best ever, but he was an animal in those early years.