Back up the train, I missed the derail!
NIN is still one of my top 5 bands. For live performances, they are at the peak. I've seen them 4 times, and every concert had a substantially different setlist, visuals, and mood. Each time I saw them was a different tour, so the changing band members added to the variety too.
I never specifically associated them with teenage angst since I didn't get into them until after high school. 'The Fragile' was the one I initially connected with the most, and it's still my favorite. The 'angst' thing is a bit dismissive. So all metal and industrial music is for teenagers? Nah, I don't think so. Humans of all ages can connect with it. NIN stuff falls more into the composed pop-rock end of the songwriting spectrum, anyways. Out of his recent stuff, 'Year Zero' and 'Hesitation Marks' have shown a lot of growth and maturity.
Johnny mentioned Jane Siberry above. She's one of my favorite musicians as well. Her albums Maria, When I Was A Boy, Bound By The Beauty, and The Walking are all outstanding.
Also, y'all have me craving a Crow reboot with tophatted Bradley Cooper, and a dubstep soundtrack, directed by Len Wiseman. It could've been the biggest moderate hit of 2010!