"Scathing reviews" refers to highly critical or harsh evaluations or comments about something, usually a piece of work or a performance. Full definition
I've read scathing reviews of Killing of a Sacred Deer that make it my most anticipated film of the year. (thefilmexperience.net)
But the same year, Mr. Twombly's «Nine Discourses on Commodus,» an ambitious painting cycle he made after the assassination of President John F. Kennedy, based on the life and death of the Roman emperor, received scathing reviews in a show at the Castelli gallery. (nytimes.com)
Almost immediately, you'll find scores of scathing reviews from people claiming they've been ripped off, misled, or otherwise defrauded. (resumewritinggroup.com)