I'm pretty much a fan of Tyson as he was really a one-of-a kind HW, being short, fast, great defense and would kill you once in the box. But frankly, he was at his best when Kevin Rooney was around and he didn't box so many greats at the time: Holmes was way over-the-hill (I expected him to get KOd in the 1st round), Tony Tucker gave him a hard time (with a broken hand) and finally things collapsed. I'd think a prime Holmes (way lighter and faster) would have already given Tyson some trouble.
Those '70s HW will forever be remembered because the field was much greater: Ellis, Quarry, Bonavena, Ron Lyle, Ken Norton then guys like Ernie Shavers, Cooney, etc....