Rango is a chameleon. Literally. He is wandering through the desert, having escaped the clutches of a hawk, when he stumbles into the town of Dirt. After massively exaggerating his skills as a gunfighter, challenging the town hoodlum to a duel and (accidentally) killing the town's greatest menace, a large hawk, he is made Sheriff of the town. It is then that he discovers that the town has a massive water shortage. After chasing down some outsiders who robbed the bank, it appears the reason for the shortage may be due to intentional interference, and may be close to home.
Good fun. Started pretty badly - plot was over the place and it appeared you needed to be high to enjoy it. However, from a point, around about the saloon scene, the movie finds focus and kicks up several notches. Ends having a decent plot (though a tad derivative of Chinatown), some good humour, great CGI and good action sequences.
Vocal casting is spot-on, with Johnny Depp to the fore as Rango. All-star supporting cast delivers in spades.