The story itself is a composite of all the elements needed to make a great Western: good guys in white hats, bad guys in black hats, townspeople content to stand aside and to let the battle be fought between the outlaws and the man with the tin star, a beautiful woman to distract the hero and finally help him when the chips are down.
The main stars, John Wayne, Dean Martin, and Angie Dickinson all turn in the top-notch performances one would expect from them, and Rick Nelson is a very pleasant surprise as Colorado. It's two others that separate this movie from other Westerns, though.
Pedro Gonzales-Gonzales, as Carlos the hotel-keeper, is a breath of fresh air. His interplay with John Wayne's John T. Chance adds a touch of human reality to the movie that sets it apart.
Walter Brennan in his role as Stumpy, however, is the glue that holds the whole thing together and makes it work. His constant griping under his breath, his goading of Wayne, his dialogue with the prisoner and his general comic relief set Rio Bravo apart from any other Western and put it in a class of its own. Keenan Wynn in Eldorado doesn't even come close.