Set five years after the events of Borderlands, Handsome Jack, the game's main antagonist, has taken over the Hyperion corporation, has declared himself Dictator of Pandora, and stolen all of the credit for finding the Vault, going so far to claim responsibility for killing the Destroyer. Jack has also blotted out much of the light on the planet by having a giant orbiting H-shaped base set in front of Pandora's stationary moon. The new team in Borderlands 2 is tasked with killing Jack and returning peace to Pandora.
This review may contain spoilers
I really didn't expect Borderlands 2 to be better than part 1, but it is, well as for me. The plot and characters make a big difference compared to 1st game, some other minor features like crate types and surprises inside, additional vehicle etc also help the gameplay nicely. Definitely recommend it for those who like open-world or sci-fi games, it's a game to spend a couple of weeks entertained easy.