Drum contains everything I like in 70's movies: Pam Grier, Rainbeaux Smith, Warren Oates, Yaphet Kotto, squiby over the top violence, and big-budgeted political incorrectness all in the guise of a angry blaxploitation flick. All that was missing was a little extra orange in its fake-blood recipe.
The film also wisely cans the serious frothy soap opera claptrap that helped make Mandingo the face-palmingly icky misfire it was. Drum at least knows exactly why you're here and has less shame in it's exploits, which makes is not as interesting, but much more enjoyable than it's predecessor. So perhaps that's for the better.
I'd actually go so far to say I liked this more than the tonal mess that is Django Unchained. They both are strikingly similar, but I think Drum plays out its revenge fantasy in a better way.