Due to patches on the warrior killing exploit, one of the best ways to speed level is repeating the beat down bar brawl over and over. Every time a lv50 character completes the mission for you, you gain a level (up to level 25).

Due to patches on the warrior killing exploit, one of the best ways to speed level is repeating Bar Room Blitz in Pyro Pete's Bar (Mr. Torgue's Campaign of Carnage DLC) over and over. Every time a level 50 character completes the mission for you, you gain a level (up to level 25).

due to patches on the warrior killing exploit one of the best ways to speed level is repeating the beat down bar brawl over and over up to about level 25 each time you complete the mission you gain a level (this is with a lv50 character doing the mission for you)

Due to patches on the warrior killing exploit, one of the best ways to speed level is repeating the beat down bar brawl over and over. Every time a lv50 character completes the mission for you, you gain a level (up to level 25).