The 'For Your Entertainment' singer drew a mixed reaction for a review of the musical, where he accused the all-star cast of "pretending to be singers" by performing their songs live on set.
"With that cast, they should have studio recorded and sweetened the vocals. I felt like I should ignore the vocals and focus on the emotional subtext - but the singing was so distracting at times it pulled me out," Lambert suggested in his December 30 review.
The comments elicited a response from Les Misérables actor Russell Crowe, who acknowledged that Lambert raised valid points.
"I don't disagree with Adam," Crowe tweeted on Wednesday (January 2). "Sure it could have been sweetened, Tom Hooper wanted it raw and real, that's how it is."
Former American Idol star Lambert reflected on his critique of Les Misérables in another series of Twitter messages on Wednesday night.
"My movie review has gone viral. U can spend a whole year praising artists for inspiring work, but one critique gets all the attention. Funny," Lambert quipped.
He continued: "Those raw and real moments when characters broke down or were expressing the ugliness of the human condition were superb. However... My personal opinion: there were times when the vocals weren't able to convey the power, beauty and grace that the score ALSO calls for.
"I guess I'm a purist for the original LIVE broadway recording when the actors sang the f**k outta those songs. JUST an opinion... I should prob stop fanning the flames on this one..but i love a good debate- couldnt help myself."
Lambert went on to profess his admiration for Anne Hathaway, who plays Fantine in the musical adaptation.
"One last thing though: Anne Hathaway was so good- had me tearing up. Oscar worthy performance for sure! Ok. #donediscussinglesmiz," he teased.
Les Misérables finished third at the US box office over the weekend by taking in $28 million.
The film is out on January 11, 2013 in the UK. Watch the Les Misérables cast talk to Digital Spy below:
Photo gallery - the Les Misérables world premiere in London: