Hair metal is... sometimes good.
I'm often a bit dissappointed in the music itself, and the vocals just aren't my thing at all. Some of it has much better music (Iron Maiden, Anthrax, others), so I still listen to it from time to time (Judas Priest, everything before Hellbent for Leather)
If you cannot find anything good to listen to in any year, you just aren't looking hard enough. I listen to everything from Bach to Vampire Weekend. Some hits, some misses, some just a bit bland and boring. Never has there been a year with only bad music.