IMO, Underrated threats are good to have on a team, as you can surprise the opponent (e.g. SpDef Skarm, Specs Hydreigon/Chandelure, etc.).
Honestly, I have no idea why nobody uses BandNite. It absolutely rips holes once Steels have been removed. It can 2HKO anything that doesn't resist Outrage that isn't named Cresselia. Even physically defensive Hippo is 2HKOed after SR and Lefties.