This isn't the same as the list of Metal Bands for Beginner Fans. It's a list of bands that would be inappropriate to recommend to people who are new to metal.
I'm not saying these bands are bad or anything. I actually love some of them. It's just that they would be too extreme, explicit, or complex or beginners.
If you really want to get people into metal, I'd suggest you recommend them some good old traditional metal or power metal. Those genres are at least not too extreme or progressive.
The Top Ten
1GorgorothGorgoroth is a Norwegian black metal band based in Bergen. Formed in 1992 by Infernus, the band is named after the dead plateau of evil and darkness in the land of Mordor (a fictional location in J.R.R. Tolkien's The Lord of the Rings).
This is a legit satanic band. They were know for putting up naked crucifixes and decapitated goat heads at a concert once.
Black metal would be a terrible genre to recommend to beginners because not only is it extreme, but that most bands in the genre try to be as satanic as possible. So don't recommend this group or other black metal groups to beginners.
2MayhemMayhem is a Norwegian black metal band formed in 1984 in Oslo, regarded as one of the pioneers of the Norwegian black metal scene. The band is also known for the infamous events surrounding them including the 1991 suicide of vocalist Dead (in which former guitarist Euronymous took pictures of Dead's ...read more.
Another satanic band on the list. All the members of this band are mentally insane. Their lead singer would always cut himself onstage with glass and paint his face like a corpse. He later committed suicide in which their guitarist took a picture of his dead body and used it as the cover of one of their live albums. This sure is some creepy stuff right here for beginners.
3Cannibal CorpseCannibal Corpse is a American death metal band from Buffalo, New York, formed in 1988. The band is known for their graphic album covers, explicitly violent lyrics and song titles like "I C** Blood" The group got into mainstream after performing the song "Hammer Smashed Face" in the 1994 film Ace Ventura: ...read more.
This band has a lot of sexual and gory album covers. And their violent song titles would absolutely scare away beginners.
4Anal C***Anal C*** was an American grindcore band founded by vocalist Seth Putnam in 1988. The band is known for their highly offensive lyrics which included themes of misogyny, homophobia, racism, Nazism, antisemitism, and schadenfreude (ridicule of the unfortunate). Their music has been received negatively ...read more.
Good thing it wasn't the first metal I got to know about lol - Ananya
Definitely one of the most offensive bands ever formed. Their song titles are enough to offend beginners everywhere. Song titles include Hitler Was a Sensative Man, I Sent a Thank You Card to the Guy Who Raped You, and I Gave NAMBLA Pictures of Your Kid (look up NAMBLA and you'll see why beginners would absolutely hate this band).
5Cattle DecapitationCattle Decapitation is an American Deathgrind band from San Diego, California formed in 1996. Cattle Decapitation's songs protest the mistreatment and consumption of animals, the abuse of the environment and touch subjects such as misanthropy and genocide of the human race. Much of their music is based ...read more.
Similar to Cannibal Corpse in a way. The music video to their song called Forced Gender Reassignment was so violent and messed up that it got banned from YouTube. So yeah. Don't recommend these guys or the video to beginners.
6Cephalic CarnageCephalic Carnage is an American deathgrind band formed in 1992 in Denver, Colorado. The band comprises vocalist Lenzig Leal, guitarists Steve Goldberg and Brian Hopp, drummer John Merryman and bassist Nick Schendzielos.
Watch at your own risk. The video to Ohrwurm is even worse than Forced Gender Reassignment...
7SlayerSlayer is an American thrash metal band from Huntington Park, California, formed in 1981 by guitarists Jeff Hanneman and Kerry King. They rose to fame with their 1986 album Reign in Blood, and is credited as one of the big four of thrash metal bands, the others being Metallica, Megadeth, and Anthrax. ...read more.
They're not legit satanists (heck their frontman is Catholic), but they use satanic music for shock value. They mostly sing about satanism, serial killers, war, they even have a song about Nazi torture doctor Josef Mengele. This band would be very bad for beginners.
8BrujeriaBrujeria is a Mexican-American extreme metal band formed in Los Angeles, California in 1989. Their name comes from the Spanish word for "witchcraft".
This band mostly sings about satanism and gore, but I think Trump haters would love them considering how they have a video where they chop off Donald Trump's head.
9Dream TheaterDream Theater is an American progressive metal band from Boston, Massachusetts. The band was formed in 1985 under the name of "Majesty", only to change its name to Dream Theater later. ...read more.
They're not too heavy and they use clean vocals. But the reason I put them on here is because most people can't handle complex music and DT is very, very complex.
10Type O NegativeType O Negative was an American gothic/doom metal band formed in Brooklyn, New York City in 1989. Their lyrical emphasis on themes of romance, depression, and death resulted in the nickname "The Drab Four".
They're not too heavy, but the cover of one of their albums features the frontman's sphincter (Google sphincter and you'll see what I mean).
11NileNile is an American technical death metal band from Greenville, South Carolina, United States, formed in 1993. Their music and lyrics are inspired by Ancient Egyptian/Near Eastern mysticism, history, religion, and ancient art, as well as the works of H.P. Lovecraft.
13Anaal NathrakhAnaal Nathrakh are a British extreme metal band formed in 1999 in Birmingham, England. They are currently signed to Metal Blade Records.
14MeshuggahMeshuggah is a Swedish progressive metal band from Umeå, formed in 1987. They are often considered the fathers or founders of the djent metal sub genre due to their use of downtuned guitars. They are also known for their song “Bleed”, which is known for its extremely complicated instrumentation, ...read more.
15ImmortalImmortal is a black metal band from Bergen, Norway, founded in 1990 by frontman and guitarist Abbath Doom Occulta and former guitarist Demonaz Doom Occulta.
16EmperorEmperor was a Norwegian black metal band formed in 1991, regarded as highly influential by critics and emerging black metal bands.
17DecapitatedDecapitated is a Polish technical death metal band formed in Krosno in 1996. The group comprises guitarist, founder and composer Wacław "Vogg" Kiełtyka, vocalist Rafał Piotrowski, bassist Paweł Pasek, and drummer Michał Łysejko.
18DisembowelmentDisembowelment, often styled as diSEMBOWELMENT, was an Australian death/doom band that formed in November 1989 featuring Renato Gallina on guitar and vocals, and Paul Mazziotta on drums.
20BenightedBenighted is a French technical deathgrind band formed in Saint-Étienne in 1998. The group comprises vocalist Julien Truchan, guitarists Emmanuel Dalle and Olivier Gabriel, bassist Pierre Arnoux and drummer Kevin Foley.
22KronosKronos is a brutal death metal band from France. Their name is a reference to the titan Cronus, the father of Zeus in greek mythology.
2313491349 is a Norwegian black metal band from Oslo, Norway, formed in 1997. The band's name comes from the year the Black Death reached Norway.
24CarnifexCarnifex is an American deathcore band from San Diego, California. Formed in 2005, they are currently signed to Nuclear Blast after having been signed to Victory Records and have released five full-length albums and one EP. The name of the band is derived from the Latin: carnifex, meaning "butcher" ...read more.
25Stalaggh & GulagghStalaggh comes from the German word "Stalag" which was a concentration camp in Germany in World War II; the g and the h following after Stalag mean "global holocaust." The band consists of many top musicians from the Dutch and Belgian Black Metal/Industrial scene.