Often mislabeled as "post-grunge" or, I've heard someone label them this, and I just about flipped my lid, "grunge" even. They're not even close to being grunge, much less post-grunge.
If Nickelback is anything, they're another nu metal band that's trying to be as cool as Korn, Slipknot, or Limp Bizkit for that matter.
Smart person (sporting a Nirvana shirt): "You idiot. Go listen to the Melvins or Soundgarden or Green River if you wanna hear some real grunge."
Smart Person: ...wow...grow a fuckin brain idiot...
DE: Look at this crappy band, I want to fling shit at them.
DS: Oh yeah! Nickelback bites the big one!