The fact he's being actively discussed in a thread about books that changed one's life, and your only criticism of the man is an ad hominem, would suggest that he's still very relevant.
I don't care about Peterson. I don't have time to study every intellectual's work. The signals I continually get about Peterson are that he's a hypocritical conservative sexist. Hypocritical in the sense that he presumes to have the answers for life, while landing in a coma due to drug abuse.
Ad hominems are relevant when the person's work involves telling people how to be.
Ad hominems are relevant when the person's work involves telling people how to be.