To me; any album that qualifies as "Greatest Debut Album" would have to cause a seismic shift in the musical and cultural landscape; and forever change the genre in which it appeared.
With that in mind; there can be only one:
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(I chose the U.K. version because it has "Red House" on it; and I like the cover much better.)
hold off on any judgement on my decision, but i love metal, and this band has what i think of as a 1 hit wonder. machine heads "burn my eyes" had so much promise. theres probably a ton of others that fair off better, but this sticks out to me