I watched this specifically to see location footage of San Francisco circa 1978/79. I enjoy that sort of thing and if you do to it's worth putting on in the background. (Particular dug the nighttime shots of the clubs on North Beach).
Other than that? Ehhh...The film itself does have a shaggy Bay Area charm and it features some decent character actors but,ultimately, it plays like a slightly quirkier version of a TV procedural from that period.