A gazillion reviews:

Borderlands 2: The Kotaku Review
Review: Borderlands 2 review: Huge scale and loot addiction paper over the cracks - ComputerAndVideoGames.com
Review: Borderlands 2 -Destructoid
Borderlands 2 review • Reviews • PC • Eurogamer.net
A Genre-Blending Triumph - Borderlands 2 - Xbox 360 - www.GameInformer.com
Borderlands 2 Review - GameSpot.com
Borderlands 2 Video Review and Ratings - GameTrailers
Borderlands 2 Review - Giant Bomb
Borderlands 2 review: Non-trivial loot pursuit - Joystiq
Borderlands 2 PS3 review
Borderlands 2 Review - PLAY Magazine
Borderlands 2 Review PS3
Borderlands 2 Review (PS3, Xbox 360) - TheSixthAxis - PlayStation PS3, PS Vita, Xbox 360 And Nintendo News, Reviews, Previews And Opinion
'Borderlands 2' review: firing range - The Verge