From my own PoV, NPR and their stations in my area mostly went to crap back ~2000 - shifting formats from music-heavy to much more talk-heavy and news-heavy (especially after 9/11), and seeming far more idiotic and partisan as part of that.
I still recall listening to an especially wretched NPR news story ~2003 - where (in effect) Senator Slime(D) insisted that 2 + 2 was 3, Senator Sleaze(R) insisted that 2 + 2 was 5, and NPR was far too fair, balanced, and brain-dead to even hint at the possibility of 4. I stopped tuning in, and never donated another dime.
I still recall listening to an especially wretched NPR news story ~2003 - where (in effect) Senator Slime(D) insisted that 2 + 2 was 3, Senator Sleaze(R) insisted that 2 + 2 was 5, and NPR was far too fair, balanced, and brain-dead to even hint at the possibility of 4. I stopped tuning in, and never donated another dime.