 What survives in "Bad Habits" is not so much a focused evening of theater as a pair of overextended burlesque sketches that live or die from joke to joke... Mr. McNally is incapable of being completely unfunny, and, in his better moments, he imagines a Dr. Feelgood whose unctuously whispered words of wisdom are babytalk and a skirt-chasing gardener whose libidinal urges are written all over his anatomy, not to mention his face.