The new documentary "Best of Enemies" shares a lot in common with the debates it's chronicling - the biggest of which is that despite its shortcomings, it's still bitingly entertaining and engaging. Co-director Morgan Neville - working with Robert Gordon - may not be a great storyteller, but he knows how to spot great stories. That was the case with the background singers in "20 Feet from Stardom," and that's the case here with Vidal v Buckley.