 The album received a positive reaction from critics, who praised By the Way for its melodic, multilayer and textured styles. AllMusic's Zac Johnson said that the album was "sophisticated ... the Peppers have not sacrificed any of their trademark energy or passions for life, universal love, and (of course) lust". Rolling Stone called the album "insanely melodic" and a "near-perfect balance of gutter grime and high-art aspiration", comparing it to other works, such as The Beach Boys' album Pet Sounds. Mojo applauded the recording, and considered it to be "the strongest Chili's album since 1991's Blood Sugar Sex Magik". Giving the album 5 stars out of 5, Q called By the Way "A fantastic record; full of wonder." Kimberly Mack of PopMatters commented on how the album "... showcases a more sophisticated, lush sound that only today's Peppers could have conceived", and that "Anthony Kiedis' lyrics are more personal than ever." Frusciante was, in his eyes, "a musical talent to be reckoned with and is the undeniable X factor in the Red Hot Chili Peppers' sound."
