Honestly metal is such an extremely wide genre with so many different subgenres that putting it all under just "metal" is disingenuous. So while a lot of metal fans like my self will appear to like only metal, what constitutes "metal" will differ from person to person. I myself include industrial and some post grunge under the label. Its not like they have to throw shit in there only metal fans would like, how about pantera, or white zombie, or five finger death punch, or anything else that's mainstream? I'm not that picky.