I am. You have to beat the campaign multiple times to unlock harder difficulties and I'm not sure if it's worth all that time.What the hell is “normal”?
@Mowgli are you familiar with this “normal”?
There are vault hunter challenge inside some of the tougher stages in the game and when you compound that with mayhem 11 that should give you all the challenge you need if you don't want to play through this 2 and 3 times to unlock harder base difficulties.