The 'Your Body' singer, who announced last month that she is taking a hiatus from The Voice, accused Simon Cowell's Fox competition of stereotyping contestants.
"We're not there [on The Voice] to bash talent," Metro quotes her as saying. "We're not here to tear people down just for ratings or just for fun or just to make ourselves look good.
"The whole concept of the blind auditions is truly genius. There are no stereotypes that you can judge someone on, other than their genuine talent and raw vocal skill."
Despite praising The Voice, Aguilera has admitted that she is unsure about returning to the NBC show after its fourth season next year.
Shakira and Usher have been confirmed to replace Aguilera and her fellow departing coach Cee Lo Green.