How did he fizzle out quickly when he had damn near a decade of dominance? Even if you say he fought no one of note in his prime, he was still dismantling those dude with the quickness. You couldn't even leave the room to get your snacks during Iron Mike bout. He was not letting those "no ones" as you out it, go 5-7 rounds with him.
He didn't have a decade of dominance, you don't know what you are talking about.
HE had 4 years of dominance in which the only ATG he fought was a out of prime and near shot Holmes. That is it.
You will not be evaluated and placed with the boxing HW greats if you don't have any ATGs on the resume, especially no wins, on top of that he couldn't even say he had a long reign, 4 year span, his shined brightly and burned out quickly.
The fact that you want to talk about popularity and not quality of wins tells me all I need to know.