While Metal isn't the only genre I listen to (and I really could care less if this makes me any less "true") it is the genre I listen to the most and I do attend gigs. I also play the drums in a Thrash Metal band and a Folk Metal band and have played and performed in a Black Metal band. (even though I'm not into the Black Metal scene that much anymore because of the elitist attitude some have)
My favorite genre is Death Metal.
DEATH METAL: Kataklysm (had a meet & greet with their Vocalist, Maurizio), Deicide, Death, Cannibal Corpse, Obituary (especially older material like Slowly We Rot and Cause of Death), Aborted, Suhrim, Aeons of Old, Serial Butcher, Pulverize (know the Guitarist personally), Unleash The Fury, Amon Amarth, Behemoth, Hypocrisy, Entombed, Unleashed, Dismember, At The Gates, Malevolent Creation, Vader (had a very brief talk with their Vocalist as well), Morbid Angel, Nocturnus, Possessed, Cryptopsy, Dying Fetus, Bloodbath, Suffocation, Nile, Incantation, Impious, The Decimation Protocol, Six Feet Under, Rudra, Vital Remains, Reign of Decay, Brujeria, Asesino, Bolt Thrower, Gorefest...
THRASH METAL: Kreator, Slayer, Witchery, Destruction, Coroner, Dark Angel, Death Angel, Venom, Metallica, Anthrax, Megadeth, Testament, Overkill, Municipal Waste, Decadence, Voivod, Throne of Blood, Hirax, Hyades, Annihilator, Holy Moses, Sodom, Tankard, Onslaught...
HEAVY METAL: Iron Maiden, Judas Priest, Motörhead, Saxon (watched them 4 times live by now, lol), Dio, Accept, Black Sabbath, After All, Armored Saint, Grim Reaper, Diamond Head, Ignitor...
POWER METAL: Iced Earth, Primal Fear, Blind Guardian, Demons & Wizards, Dragonforce (nope, don't care), Thunderstone, Sonata Arctica, Freedom Call, Luca Turilli, Rhapsody of Fire, Avantasia, Hibria, Axenstar, Nevermore, Dream Evil, Gamma Ray, Helloween, Grave Digger, Iron Savior, Jag Panzer, Xystus, Powerwolf, Hammerfall, Stratovarius... And I guess Children of Bodom, Kalmah, Norther and Wintersun would belong here to... In my opinion they're what you get when you take Power Metal and add Blastbeats and Death Vocals.
Other METAL: In Flames, Sentenced, Crematory, Rotting Christ, Marduk, Satyricon, Dark Funeral, Dimmu Borgir, Cradle of Filth (still don't care), Type O Negative, Candlemass, Cathedral, Dream Theater, Machine Head, Fear Factory, Pantera, The Kovenant, Violent Work of Art, Devildriver, Arch Enemy, Sonic Syndicate, Soilwork, Epica, Lake of Tears, Finntroll, Korpiklaani, Equilibrium, Scar Symmtery, Kyuss, Orange Goblin, Ensiferum, Sybreed, Red Harvest, The Berzerker...
My favorite bands by far would be: Death, Deicide, Kataklysm, Metallica, In Flames, Iced Earth, Obituary's older material, Crematory and Epica.
My favorite albums by far would be:
Judas Priest - Painkiller
Slowly We Rot - Obituary
The Stench of Redemption - Deicide
Organasm - Alchemist
Number of the Beast - Iron Maiden
Serenity in Fire - Kataklysm
Symbolic - Death
Something Wicked This Way Comes - Iced Earth
The Arrival - Hypocrisy
Darkness Descends - Dark Angel
I however also listen to various other music genres... Alternative Rock, Punk, 70's Hard Rock, some New Wave and to a lesser extent: Drum'n'Bass, Hardtrance, Psytrance, Techno, Folk, Funk, Jazz, Blues, Flamenco and Classical.
I have a wide taste of music and can generally stand anything that is not R&B, Country, Schlaeger or Emo Pop.
But Yeah, Metal is very high up there for me.