The opera singer, who came runner-up with G4 on the show four years ago, said he thought the show was becoming too sentimental.
“Simon’s gone all out to Americanise it with the helicopters, the cars, and glamming it up. I think that worked incredibly well but I got incredibly frustrated with the sob stories as the show went on,” he said.
“You need to give people the benefit of the doubt from their performance and then later on in the show maybe show what’s happened in their life. But to do it so early on I found a bit cringeworthy and frustrating.
“Overall I found the show entertaining but it was just that element that bugged me,” he continued.
Jonathan, who has gone on to solo success since G4 disbanded, will feature in his own talent hunt in the near future.
He will be looking for a leading lady to join him on tour with his show A Night At The Opera, and will be auditioning sopranos on ITV’s The Alan Titchmarsh Show. The winner will then be decided by a public vote.
“It’s always daunting as it’s not possible to lead the public into direction you were thinking, but it’s exciting as it’s the public who will be going to the tour and enjoying the show,” he said.