Gates of Heaven, The Thin Blue Line, and Standard Operating Procedure.
A lot of his directorial choices... I just really disliked. For example, the reenactments on TBL I found to be public access level bad, I don't like the way they're edited... I thought SOP was his tightest of the three, which shows maybe I should give more time to some of his other newer work. However, the early works in general feel like they've all got 10-15 minutes tacked on by interviews that just seem to go off into a random tangent, and I found them boring.