There are a number of things that can and will go wrong with a revolver if you do not maintain it. On the older 4 and 5 screw guns if the trigger guard screw works loose, the gun won't work. Also, any kind of fouling under the ejector star will cause the revolver to bind. And early Smith's, the ejector rod would work loose, and that would mess things up as well. People say Smith quit recessing the chambers on their revolvers as a cost saving measure, I personally believe it was to improve reliability. Any kind of fouling in the recess for the rim will cause drag and other problems.
Another way to look at it, if the revolver was superior to an auto, the Military would still use it.