Aye, the first time i met one o' those guys, i had some srs trouble. I was all "well he ain't resisting mah shotgun >:C" but then he only lost like 10% health on a full buckshot to the chest. I ended up berserking him to death, i think. Badass Bruisers in particular can be really nasty, especially when they have TRIPLE ROCKET LAUNCHERS ARAGRHAGRHAGR. Engaging them in a bazooka war is pretty hardcore, though.

They're real hard on playthrough 2 aswell ;-;.

And when I use sledge's shotty I usually kill him in 3-4 hits. It does 136x 11 damage :D