The 'Delilah' singer - who is joined by Jessie J, will.i.am and Danny O'Donoghue on the BBC contest - said that Simon Cowell's rival show had failed to find "stars with world-class voices".
"Some of their judges aren't even singers and wouldn't be able to sing a note, so what do they know?" he told The People. "Every time I see one of these shows I think half the decisions are wrong and it really frustrates me.
"Some of the judges don't have the experience to be on talent shows - if you've only been in the industry two minutes, how can you offer advice?
"I have the experience and I listen to all sorts of music, so the advice I give will be valuable."
Jones said that it was his disappointment in the poor judging decisions and "sob stories" of The X Factor that inspired him to join The Voice.
"I got fed up with shows like X Factor and thought I better do one myself because the judging has been questionable. A singing contest should be about someone's voice - not PR spin."
He added: "I'm genuinely excited about The Voice - it's exciting, competitive and compelling television because it's all about talent."
Jones's comments to the paper have apparently angered Cowell, who has admitted in the past that he is worried about the competition posed by The Voice.
"You are basically talking about worldwide success for nearly all of the stars who've come through the ranks on Simon's shows," a source said. "It's a bit rich for someone appearing as a judge on a BBC show that hasn't even started yet to criticise him.
"Simon's always held Tom Jones in high regard but he's being drawn into a PR stunt by the BBC when he should know better."
The Voice is believed to be launching on Saturday, March 24.
> The Voice UK Tom Jones, Jessie J, will.i.am, Danny: Meet the coaches - video
Scroll through images of The Voice UK launch below: