Owen Gleiberman Chief Film CriticIt used to be that when you called a movie a glorified sitcom, it was an insult. But when you watch “Fatherhood,” an unabashedly formulaic, undeniably sweet Netflix dramedy in which Kevin Hart offers up a benign variation on his trademark irascibility in the role of a devoted but desperate single dad, it’s easy to imagine the sitcom version as richer, deeper, more layered.