Roman Gonzalez is 38-0 with 32 KOs. He's been a dominant world champion at minimum and junior flyweight and already has a decisive win on his resume against current WBA and WBO flyweight champion Juan Francisco Estrada.
Most serious boxing fans realize Gonzalez is the top fighter in the world below 115 pounds. But until I see him become ubiquitous in pound-for-pound top 10s, I will continue to regard him as criminally underrated.
But in general, the lowest weight classes tend to be underrated as a group. So, too, for some reason, is the cruiserweight class.
Other fighters end up underrated due to style or lack of presence in the U.S. media. Sometimes it's not even easy to tell why a fighter is underrated.
And ultimately, whether a fighter is underrated or not is always a subjective call.