He's probably explored the genre in the past, but considering the "metal bands" from the 80's and from then on, I personally wouldn't consider him metal.
But since metal is so subjective to the listener, how does one "define" metal? Heavy guitars? Screaming? Headbanging riffs?
I'd call him/them Metal. He's a legend of Metal without a doubt and quite important & influential alongside Black Sabbath, Whitesnake, Judas Priest, W.A.S.P. & Dio.Any want to put A.C. in the Metal category ? I would have to say he misses Metal by a hair. His biggest hits are hard pop rock at best. Tho I think the band rocks like a **** on many other songs, they're a little shy of the metal genre. ok,flame away..
He looks metal, sounds metal in his interviews, dresses metal, but I still don't feel the metal thru the music, very heavy at times tho.