My brother got it and played through the questline in one night.
The ending was hilarious.
Also, Kreig is apparently stupid OP with Mania maxed out. He's basically immortal, since every time he hits 33% HP he can use his active skill, and charges to full HP, and then restores to full HP again with every kill. Then, when it wears off, IT REFRESHES SO HE CAN DO IT ADINFINITM AT 33% HP. If he SOMEHOW goes into F4YL, he instead goes into LIGHT THE FUSE, and throws huge damage explosives everywhere while running around at high speed....
Also my bro has a 0 power shield that gives 20% bonus HP, so he always gets all those 'Shield down' bonuses. He's only low 4's but hitting like 200+k with his action skill, and 6~7 hits bosses... as well as soloing the new DLC raid boss.
I'm not a cheapskate who plays easymode, so I'm gonna play Kreig with the 'SET YOURSELF ON FIRE' build.