Larry Holmes would have gotten a ton of criticism. I suspect people would find reasons to bash Sugar Ray Leonard, even when he was fighting Benitez, Kalule, Duran twice, and Hearns in a 2 year period. Evander Holyfield would've gotten a lot of criticism in his first title run at heavyweight.
Billy Conn, Willie Pep, and Pernell Whitaker would get the most hate. They would call them feather fisted runners.
chris eubank and frank bruno used to get their fair share of critism a while back, dont know why they were both good boxers especially eubank!!!