Guess I'm in on this one too. I'm not a total metal head or anything but I must say that I do enjoy listening to some of the music the genre has to offer. My preferences out of this genre are:
Daisuke Ishiwatari (I love this man to death. He only made music for the Guilty Gear and BlazBlue soundtracks, but these soundtracks consist of some of the greatest instrumental works I've heard in my entire life. That's saying a lot just for video game soundtrack, honestly.)
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In Flames (I prefer their Clayman, Colony, and a fraction of their Soundtrack to Your Escape albums. I don't really like their newer stuff, it just doesn't sound like the same greatness anymore... :\)
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Five Finger Death Punch (I think the only song these guys have made that I really don't like is The Bleeding. Just a little too heavy for my tastes.)
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Slipknot (I'm just a tad picky on their songs)
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Dope (American Apathy, enough said. Unfortunately it's one of the only albums I own from Dope.)
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Ministry (haven't heard much but what I have heard, definitely a check off for a'okay)
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Slayer (even if a lot of their songs sound almost identical, they're STILL good regardless)
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Celldweller (This guy is pretty damn good. Though I don't think he belongs here as an entirety of an artist, he has made a few songs that fit perfectly in the metal genre)
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System of a Down (I've kind of fallen away from SoaD over time, but I threw them here anyways.)
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Rammstein (come on, almost everyone loves a little Rammstein)
There's more artists that I like in this genre, but I just threw a few out that I can think of off of the top of my head. There's not many, I know, and it's because ever since I listened to what Daisuke Ishiwatari had to offer, my standards shot through the roof. I'm glad to have stumbled across Metal Hell though, maybe with the preferences I've posted, you all can help me find a little more that I might like.