I would consider myself a metalhead, though I probably don't know even HALF of the bands that are considered to be the best or the most influential in that genre. I dislike Black Metal (except maybe for Dimmu Borgir), but I enjoy every other Metal Genre, most of all Death Metal, Thrash Metal and Prog Metal. Power Metal is fun as well, even though it is kinda stupid sometimes. But maybe that is the fun part about it :)
Some of my favorite Metal bands are Gojira, Anthrax, Trivium, Soen, Dream Theater, Disturbed, Avenged Sevenfold, Tremonti, Death Angel, Lamb of God, Nevermore, the HU, SOAD, Volbeat
I also listen to some Powerwolf, a little Opeth, Eisbrecher and Rammstein, Five Finger Death Punch, some Exodus, Hatebreed, Dragonforce, Halestorm and of course old school Metal bands like Judas Priest, Metallica, Iron Maiden...
I love many other musical genres and bands outside of Metal, too. Most of all probably Shinedown, Thousand Foot Krutch, Alter Bridge, Breaking Benjamin, Starset, Fever 333, Slash, Soundgarden but also Blues Rock/singer/songwriter stuff like Joe Bonamassa, Myles Kennedy or ZZ Top. And I like Oasis, sue me :P
There's a lot of music I enjoy, but similar to what @
QueenNoodles said, I do love headband-worthy songs with good riffs the most. That's just what I grew up with :D There are maaaaany others I haven't talked about but I'm rambling as it is, so I'll stop here.
P.S. @
antelope I love Painkiller, he is the perfect embodiment of the song. Awesome apparel choices and the familiar is the cherry on top!