The Black Eyed Peas singer described the acts in 2016's series as "nothing really memorable" as the show moves to ITV this year.
He claimed of last year's final series on the BBC: “It lost its excitement for a lot of reasons.
"The singers last year, there was nothing really memorable. How they picked the talent was like, blah.”
Understandably, those on the show last year weren't too impressed with Will's comments.
Vangelis Polydorou - who made the live shows on Boy George's team - tweeted: "@BoyGeorge @iamwill it was blah because @iamwill was on it. Personally I would want a singer to judge me...😬 #thereforthemoney"
Team Will's own Lydia Lucy replied: "hahaha 😂 I thought @iamwill said the talent was DOPE??"
Melissa Cavanagh added: "if you can't say anything nice, don't say nothing at all 😂😳"
And Aine Carroll wrote online: "rude😕😬"
Meanwhile, one viewer quipped: "it wasn't a flop to him when he was taking a big pay packet though from the BBC."
Speaking ahead of The Voice UK's move to ITV from tonight, Will said this year's singers would all be "great".
“Being on ITV now, you feel their excitement and the new stage and the production. Now every singer is great. We haven’t seen a seven. Everyone is eights, nines and tens," he told the Daily Mirror newspaper.
Whether or not the singers really are better remains to be seen but there's no doubt that ITV are changing things up on the show.
On the coaching line up, ITV have undone the BBC's controversial work to bring back Sir Tom Jones to the show alongside Will.i.am and two new names: American singer Jennifer Hudson and British rocker Gavin Rossdale, lead singer of Bush.
There's also a brand new look set and more live shows, with the knockout rounds to be aired live this year for the first time ever.
Another change is in the prize: The winner of The Voice UK 2017 will scoop a life changing record contract with music giants Polydor Records.
But will any of the tweaks make for a better show?
The Voice UK 2017 starts this Saturday night, January 7 on ITV from 8PM.