This movie is awesome. It's far less action packed than I thought it would be, and also contained a lot more tropes and elements of later blaxploitation ilms (cliches, stereotypes, etc) than I expected, but that's okay.
This is a detective story that basically feels like a gritty 1970s take on a hardboiled film noir detective story, with a black guy as the lead instead of a white guy. It's got some modern touches (well, modern for the 1970s), but basically feels timeless with the general story at hand.
Gordon Parks, Sr. gives some top notch direction filled with grit, style, and flair. Richard Roundtree is great in the role that made his career, and of course, the music is nothing but badass. If you haven't seen this one yet, you really need to. It's a classic of it's genre, and just a classic film from its time.