Sly Sylvester fails its lead actor, Richard Turgeon. He’s got a good costar in Jay Krohnengold, who plays his ornery landlord, but once his love interest arrives, Sly runs downhill. Tiffany Gustafson, as the love interest, trips, stumbles and falls through Kim Nunley’s dialogue. Nunley puts in way too much exposition, but Gustafson talks so…