Jasonic
Doom On!
Many styles? Yeah, they got a little commercial sometimes and sometimes kinda heavy, but they always sounded like Raven (well, Glow was a bit murky). I've said it before, they're completely unique....no one sounded like them before, and no one has sounded like them since. I would recommend either Life's A Bitch or Walk Through Fire for a newbie....hell, I love their whole catalog! Athletic Rock!!!!!
Yes. You answered your own question......
They have played different styles (IE - subgenres) of metal....
Trad, NWOBHM, thrash, commercial hard rock / metal.......
I would agree that they retained their signature sound throughout but they have explored different styles. That's not really even an opinion........