Here`s my take;
Slayer (RIB is the best thrash album of all time, HTC is the best metal EP ever), Metallica (RTL not far behind), Exorcist(US), Blessed Death, Infernal Majesty, Carrion(CHE), Juggernaut, Harter Attack, Sentinel Beast, Skull Crusher(HOL), Second Hell, Deathwish, Forced Entry, DBC, Bulldozer(ITA), Darkness(ESSEN), (old) Running Wild, Seventh Angel, Devastation, Nasty Savage, Atomkraft, Living Death, Onslaught, Watchtower, Annihilator, Coroner, Sacrilege(UK), Deathwish, Aggression, Iron Angel, Hallows Eve, Razor, E-X-E, Necrodeath, Holy Terror, Poison(GER), Dream Death (some call this band doom, I call them thrash)
Gammacide, Nuclear Assault, NME, Destruction, Possessed, Exodus, Forbidden, Heathen, Hirax, Vio-Lence, Anthrax, Overkill, Sadus, Rigor Mortis, Flotsam And Jetsam, Mandator, Indestroy, Kreator, Bloodlust, Viking, Dark Angel, The Haunted, Hobbs Angel Of Death, Violent Force, Slaughter Lord, Minotaur, Solstice, Voivod, Vulcano, Paradox, Abattoir, Assassin, Hades, Whiplash, Morbid Saint, At War
Megadeth, Tankard, Faith Or Fear, Messiah, Stormtroopers Of Death. Any Sodom after Obsessed By Cruelty is also worthless, IMHO.
In response to A Famine`s post; Coroner are from Switzerland, Artillery are from Denmark and Cyclone are from Belgium, assuming you were referring to the same bands.