BEST Covers-
Megadeth- School's Out (Alice Cooper)
Megadeth- No More Mr. Nice Guy (Alice Cooper)
Cannibal Corpse- No Remorse (Metallica)
Malevolent Creation- Perish in Flames (Dark Angel)
Monstrosity- Angel of Death (Slayer)
Decapitated- Mandatory Suicide (Slayer)
Emperor- Funeral Fog (Mayhem)
Emperor- A Fine Day to Die (Bathory)
Anthrax- Remember Tomorrow (Iron Maiden)
Mercyful Fate- The Ripper (Judas Priest)
Vader- Silent Scream (Slayer)
Vader- Raining Blood (Slayer)
Vader- Flag of Hate (Kreator)
Vader- Merciless Death (Dark Angel)

WORST Covers
Cannibal Corpse- The Exorcist (Possessed)
Cannibal Corpse- Confessions (Possessed)
Nuclear Assault- Good Times, Bad Times (Led Zeppelin)
Dark Angel- Immigrant Song (Led Zeppelin)
Slayer- Dissident Aggressor (Judas Priest)
Emperor- Gypsy (Mercyful Fate)
Exodus- Low Rider (War)

THOUGHTS
People should stop trying to cover Led Zeppelin, as they always fail. People should focus on covering Iron Maiden and Slayer, as they always succeed. Megadeth and Vader can do no wrong with covers. Cannibal Corpse should stop covering Possessed. What few Dark Angel covers there have been were all good.