Back in 1930, the studios thought that audiences wanted operettas and more operettas. They didn't. So, by the end of 1930, movies that were operettas were quickly converted into regular movies, without the singing. Judging by the plot, and the actual existence of a fairly decent musical score (not common in early 30s Warners pictures), this would appear to be one of those quickly converted movies.
Without the songs, the movie is both rather short and horrible. There really is only one good scene: the very pretty Fay Wray makes her entrance in a slip, because the daring bandit Captain Thunder, upon robbing her stagecoach, stole everyone's clothes. (There was some reason given, but I just don't remember it.) Wray, herself, plays a Mexican senorita with the expected amount of hot-bloodedness. Captain Thunder, alas, being middle aged with a receding hairline and advancing second chin, has far less sex appeal than King Kong. Thunder, himself, overacts unamusingly, and is only surpassed in this by the bad actor playing the commandante who never can seem to capture Thunder. Talking scenes go on and on and on and are filled with overwritten attempted comedy, or the sort of dialog that only a Lena Lamont could do justice to. If there were any action scenes, I must have slept through them.
Don't be tempted by the Fay Wray starring role. Avoid this, and save the hour and a half in your life for a second viewing of King Kong.