"A great effort [from Campbell]. I didn't have the gap anywhere near as wide as [the judges], I thought Luke lost four rounds maximum, I thought he boxed brilliantly, perhaps didn't go for gold enough," Hearn told iFL TV.
"I was slightly disappointed with Lomachenko, to be honest. We've built him up as this superstar, but I can't put him in the same category as the superstars of yesteryear on that performance.
"A great fighter, obviously, but we can't mention him in the same breath as some of the all-time greats yet.
"I wasn't particularly impressed. I thought he had Campbell hurt a few times, he didn't finish the job. I thought he coasted a few rounds, I didn't see him look the dynamic fighter we've built ourselves up to believe he is.
"He's obviously very good, but we're talking about legendary status and that wasn't a legendary status type of fight."
Barry Hearn 'Slightly Disappointed' With Lomachenko, Explains
"I was slightly disappointed with Lomachenko, to be honest. We've built him up as this superstar, but I can't put him in the same category as the superstars of yesteryear on that performance.
"A great fighter, obviously, but we can't mention him in the same breath as some of the all-time greats yet.
"I wasn't particularly impressed. I thought he had Campbell hurt a few times, he didn't finish the job. I thought he coasted a few rounds, I didn't see him look the dynamic fighter we've built ourselves up to believe he is.
"He's obviously very good, but we're talking about legendary status and that wasn't a legendary status type of fight."
Barry Hearn 'Slightly Disappointed' With Lomachenko, Explains