I saw the documentary last night. It was interesting enough.
But at the time of Nirvana's "meteoric rise" around 90 - 91. I was much more into bands like Iron Maiden, Metallica, Guns n Roses, Skid Row, Motley Crue, Thunder, Alice Cooper etc,
I find the claim that grunge killed so called "hair metal" absolutely laughable. I was barely even aware of their existence, other than the continually played Smells Like Teen Spirit that was absolutely hammered to death on MTV, they weren't even a ripple in a lake of great rock and metal music. I was actually surprised to find out that they released several albums. Never Mind was the only album I was even aware of.