I first heard 'Immigrant Song' many years ago when i was 15, and thought 'Whoa, what the fuck is this?, i must have it'.
Bought a copy the next day, played it through and (apart from the opening cut), i fucking hated it. For a few years, Zep III gathered dust at the back of my collection.
I pulled it out and gave it a spin one night after a few beers, and thought 'It's nowhere as bad as i first thought'.
As i've gotten older, i've come to appreciate what a great album this is and rate it right up among my favorite Zep work.
Maybe i have matured with age after all....