Its basically impossible to go wrong with any of their 6 first albums I, II, III, IV, Houses of the Holy, and Physical Grafitti. Personally I'd say start with the earliest ones though.
along with Prometheus, IX Equilibrium gets crap even though I love it.
I also really liked Volcano by Satyricon even though oh nO! its a major label release.
Every once in a while a song will unsettle me and sometimes really creap me out. Does this ever happen to anyone else? If so, give examples.
For me stuff like Sunn 0))), Khanate, Blut Aus Nord, and even GGFH are the worst.