Not all are quite as smitten or at least want to put the raving into perspective. Sounds like things are just the same over there as they are on this side of the pond 
The Guardian Oct 13, 2009 “Sea The Stars: Was he really the greatest racehorse of all-time?”
excerpt
As racing professionals rushed to praise Sea The Stars today, following news of his retirement, a rare note of scepticism was struck by Joe Mercer, a former champion jockey best remembered for his association with Brigadier Gerard in the early 1970s. Mercer said Sea The Stars, though impressive, was still not among the best three racehorses he had seen and cautioned against the effects of being swept up by momentary hype.
“I remember when Galileo won the King George [in 2001], they were raving about him being the best they’d ever seen,” Mercer said. "You can’t have a best horse you’ve ever seen every other year.
"I’ve always said Ribot was the best horse I’ve seen. Sea-Bird would be second and then the horse I rode, Brigadier Gerard. Sea The Stars has won six Group Ones, Brigadier Gerard won 13 and there isn’t a horse that’s got past him yet.
“You can’t fault Sea The Stars – he’s exceptional, he’s got a fantastic temperament and fantastic looks. If he was a film star, he’d be top of the ranks. But half the people who are saying he’s the best they’ve ever seen aren’t old enough to have seen the best horses. I’m going back to the 1950s with Ribot.”
A former chairman of Timeform, McGrath feels that ratings are most useful in identifying an “upper echelon” of horses. "Beyond that, as to which of them is best, it’s a question of personal choice and you believe what you want to believe.
"We know for a fact that if we mix a pot of blue paint with a pot of yellow, we’ll definitely get green. Over a matter like this, it’s different.
“I couldn’t put my hand on my heart and say he’s better than Mill Reef and Brigadier Gerard. He’s set a wonderful standard and he’s a fantastic racehorse but I don’t think he’s quite done enough.”