E!Online review:
Five years ago, Blur's Damon Albarn thought the pop charts were overrun with a bunch of phonies. Rather than whine about it like archrivals Oasis, he simply started up his own fake band: the cartoon-themed, hip-hop-heavy Gorillaz. Four million copies later, the group is still kicking. Deejay Danger Mouse (of controversial mash-up Grey Album fame) takes over the production duties on this sophomore release, but the initial premise remains the same: Albarn's chewy Brit-pop melodies are paired with brooding beats and wacky raps by playful collaborators like De La Soul, Happy Mondays' Shaun Ryder and 69-year-old Dennis Hopper. Mouse's bleak scenery means it's not as immediate as the self-titled debut, but get past the dark stuff and Demon Days reveals a stash of songs that are more fun than a Hong Kong Phooey marathon.