I'm just about finished with this fascinating documentary after finding it on YouTube. I've been a big fan of the western film since the fifties. Rich Hall's How the West Was Lost begins its history and analysis of The Western with early John Ford and spends nearly ninety minutes progressing through some 50 years of classic films, great directors and iconic stars. The nearly non-stop film clips alone make this worth watching.
Mr. Hall also does an excellent job of identifying and comparing the various themes of these Westerns and how they have evolved as America has evolved.
Side note: Is anyone else curious why someone would review a film they admit they have not watched? And base that negative review solely on a negative opinion given by another reviewer. Deep stuff.