“Monster is indeed R.E.M.’s long-promised ‘rock’ album; it just doesn’t rock in the way one might expect. Instead of R.E.M.’s trademark anthemic bashers, Monster offers a set of murky sludge, powered by the heavily distorted and delayed guitar of Peter Buck. Michael Stipe’s vocals have been pushed to the back of the mix, along with Bill Berry’s drums, which accentuates the muscular pulse of Buck’s chords. From the androgynous sleaze of Crush with Eyeliner to the subtle, Eastern-tinged menace of You, most of the album sounds dense, dirty, and grimy, which makes the punchy guitars of What’s the Frequency, Kenneth? and the warped soul of Tongue all the more distinctive” (Erlewine).
“Monster doesn’t have the conceptual unity or consistently brilliant songwriting of Automatic for the People, but it does offer a wide range of sonic textures that have never been heard on an R.E.M. album before” (Erlewine).