Part of the reason that I love James Garner is that he's cranky. That seems to fit the role much better than Burt Lancaster's nice guy role. This was more about the friendship, and how the two were more similar than different. Robards also fit better (more supporting) with Garner than Kirk did with Burt in 'Gunfight'. Kirk has a tendency to chew the scenery.
Not nearly as brilliant as "Gunfight at the O.K. Corral", but still a hell of a picture. America's fight for law and civilization is revealed by Sturges as a complete hypocrisy. Every single trial in court that the spectator watches evolves into failure and impotence. Therefore Wyatt Earp has to cross the thin line between legal and criminal action to avenge his brothers. And in the process he kills himself inside.