Stephen Stills is underrated.
He was the driving force behind three of the best (non-Beatles) songs of the 1960s/early 1970s: Bluebird, Wooden Ships, and Suite: Judy Blue Eyes; in the process he anchored two of the major super-groups of that era. “For What It’s Worth” is one of the most recognizable and oft-used iconic songs of the 1960s. “Helplessly Hoping” is good too. He was an underrated guitarist, try Super Session, with Michael Bloomfield and Al Kooper.
One of his problems may be that his underlying personal aesthetic is often corny and unappealing (“Love the One You’re With,” “Change Partners”), and that comes out all too strongly when he is removed from monitoring collaborators of equal or greater stature.
On satellite radio the other day I heard the acoustic solo demo version of Suite: Judy Blues Eyes (try “Stephen Stills Suite Judy Blue Eyes” on Spotify) and thought “People don’t praise this guy enough!” In general, artists should be judged by their best work, and his is very good indeed. I’d rather hear one of those Stills songs than anything by the Rolling Stones.