By this point, the plays of Qui Nguyen are starting to look like “seen one, seen them all.” From his earliest productions, for downtown theater troupe Vampire Cowboys, Nguyen’s works have their hallmarks: comic-book-style scenic design, martial arts, superhero and pop-culture fandom. The playwright has often been acclaimed for inventive storytelling and stagecraft. But now that he’s deployed the same gimmicks in play after play, their novelty has worn off. In Poor Yella Rednecks, Nguyen’s latest show to debut in New York, they seem obtrusive. The play is solidly plotted, with thoughtful, moving dialogue scenes. It could shed all the whiz-bang surrealities and still be a worthwhile, entertaining dramedy.