Is it just human nature to be harsh on fighters with perfect records?

Edwin Valero? Joe Calzaghe? Floyd Mayweather Jr? Shouldn't these guys accomplishments be celebrated, instead of scrutinized? Is being a world/multi-world champ and being undefeated not enough to be considered great anymore? Valero may be excused. He has no choice. It was only recently that he got exposure/license in the US.

It depends. I don't see any reason why people shouldn't be harshly critical of fighters who are protected and maintain their perfect record by taking easy (easier) fights. As an athlete who played many different sports growing up I never had a choice in my opponents and I never shied away from a challenge. Nearly every season in every sport ended in a loss. That was the reality of competition. I truly believe that it is virtually impossible for a fighter who loves to fight, loves a challenge and regularly aspires to test their limits to retire undefeated.

I just chalk it up to people being obnoxious jerks over the internet~

Do not compare Mayweather and Calzaghe. Like someone else said if Floyd beats Mosley and Pac he retires with no hate, and goes down as an atg.

with calzaghe and mayweather i see your point,as they have beaten everyone in front of them,including a whole host of world champs and top fighters the verdict is still out on valero though,he hasnt fought a world class fighter yet,so all we really know is that he has power

If he fought all the top opponents at that weight than props to him.

Edwin Valero? Joe Calzaghe? Floyd Mayweather Jr? Shouldn't these guys accomplishments be celebrated, instead of scrutinized? Is being a world/multi-world champ and being undefeated not enough to be considered great anymore? Anyone can go undefeated by fighting bums, just look at Calzaghe