Louis Walsh claims 'The Voice' UK is "dull and boring".
The music manager - who is a judge on rival show 'The X Factor' - says the BBC talent programme has failed to live up to expectations as it is not as exciting as the US version.
He said: "I hate 'The Voice'. I think everyone thought 'The Voice' UK would be like the US version, and it's not. It's dull and boring.
"It's not great TV. It's like 'Fame Academy' all those years ago. The best thing about it are the revolving chairs, and once you've seen that, the novelty wears off."
Louis - who will be joined on this year's 'X Factor' judging panel by Gary Barlow, Tulisa Contostavlos and one other - also hit out at coach will.i.am , saying he wouldn't be anywhere without his Black Eyed Peas bandmate Fergie.
He told heat magazine: "What's that man's real name anyway? It's not will.i.am, is it? He thinks he's got all the answers but if he didn't have Fergie in that band, where would he be?'
"The way he dresses at his age... what's that silly glove all about?"
"Fergie is the real star. I would love her on 'The X Factor', and to be a judge on the show."