Mad Moxxi gets a HUGE two thumbs down for me for the following reasons: I don't play co-op, so having to go through 25 waves per arena (three arenas for the initial quest, 100 waves for the larger tournament) with no breaks in between, all waves are the same and are never randomized (starter, gun, horde, badass, boss), crap loot every five waves, no exp except for whatever Get X Kills challenges you have yet to complete, and a nice story setup but absolutely NO story progression once you play.

The developers dropped the ball on this one. A total waste of my ten dollars.