Rio Bravo is one of the finest westerns ever made...not just by Duke. The other two pale in comparison but Rio Lobo is probably the weakest of the three...but still not a bad movie by any means.
Both Rio Lobo and El Dorado were what Duke termed "pay the bills" movies.
I liked "Rio Lobo" best because it felt like a spaghetti western, and it was on a more epic scale than the previous two movies.
