MY opinion is that the 80's suck big time. In MY opinion it is the time of stereotypical, greasy rockandroll music.
I like the 90's best -- it was a period in which original musicians succeded and it wasn't the shredding that made you a kick ass.
Also 60's for the grat music, as some people said before me.
Also present for some great indie bands who make indeed unique music: the names in Ninja Records catalogue.