Crowdsourcing from all 50+ mutuals on RateYourMusic (ranges from zoomers at 18 to seniors in their 70s) There's more on that list who almost exclusively stick to metal so it leads to some overall biases.
It seems like the best album of all time is King Crimson's In the Court of the Crimson King, followed by Yes's Close to the Edge
This is followed by Metallica and Iron Maiden's 80s output, some Pink Floyd, Sabbath, Ziggy Stardust-Era Bowie, 70's Black Sabbath, Judas Priest's Painkiller, and the Beatles' Revolver
So lots of rock mostly of the progressive variety and foundational metal albums, Painkiller is 90 but for this sake i'll call it an end of an era.
Exceptions?
Alt Rock - My Chemical Romance's Three Cheers for Sweet Revenge, Alice in Chains' Dirt
Electronic - Aphex Twin's Ambient Works 85-92 and Daft Punk's Discovery
Black Metal / Death metal - Emperor's In the Nightside Eclipse, Death's Sound of Perseverance, Morbid Angel's Altars of Madness
Thrash Metal - Megadeth's Rust in Peace, Slayer's Hell Awaits and Reign in Blood
Power Metal - Angra's The Temple of Shadows, Nightwish's Oceanborn, Blind Guardian's Imaginations from the Other Side
Dream Pop/ Shoegaze - MBV's Loveless, Slowdive's Souvlaki, Cocteau Twins' Heaven or Las Vegas
Jazz and Hip-hop are woefully underrepresented, only Kanye West's MBDTF shows up as it has a lot of crossover appeal with pop/electronic fans.
Ignoring crowdsourced consensus, i give a lot of praise for albums from love-it-or-hate it genres that seem to have mass appeal without muddying their sounds.
Streetlight Manifesto's Everything Goes Numb and Somewhere in the Between are loved by even ska-punk haters and Lost Horizon plays power metal so over the top that it doesn't need to be parodied.
Ian Tyson mostly sang covers but his music tends to break peoples' "I hate country" beliefs.