I watched this in preparation for the Cohen Brothers’ remake and I have to say I enjoyed it. It was a bit slow, in that pre-Mtv movie way, but was amusing. Kim Darby was right on the age of incredibly annoying and incredibly funny and it was fun to see Glen Campbell, Robert Duvall and a very young Dennis Hopper.
http://www.impawards.com/1969/true_grit.html