Mike Tyson was the most devastating and intimidating force in boxing for about five years from some point in 1985 to 1990 and I could end the story right there because that pretty much sums up his career. Oh wait, you want the rest of the story. A man who was the most devastating and intimidating force in boxing for five years, who was undisputed World Heavyweight Champion during that time is not good enough for you. You actually want more than that?
That was really the only productive part of his career. He was not only champion but was also winning fights against major contenders. For the rest of his career, he was either in prison, beating fighters who had no business fighting him, or losing to simply better fighters like Evander Holyfield, twice, and Lennox Lewis.
But the five-year run that he did have was one of the most impressive careers any boxer had. Not just because of the fights he won and how long he was undisputed World Heavyweight Champion but also because of how he won the fights, the title, and how he defended it against the best. It is not his fault that he fought in a relatively weak era.