Hehe, those days must have been cool, with music getting wilder and glam being bashed. That was because the guys from MetallicA viewed the glam guys as posers, that where giving metal a soft, commercial aspect. "If you came here to see spandex and big hair this ain't you'r band." - MetallicA's "warcry"
Talent. I heard a few glam songs myself, and MetallicA's stuff are harder to preform. You probably heard the new metallica, because yeah, these days Hetfield's voice sucks, Kirk's pretty sloppy and annoying with his wah-wah, Lars is lazy...
But there was a time when both Hetfield and Kirk shredded like mad, and Hetfield's voice was really good.