Did the world need another movie in which Bill Murray plays a wise elderly jackass? With a drinking problem, and, just for kicks, also a gambling problem? And a Russian hooker played inexplicably (if amusingly) by Naomi Watts?

No, the world did not. Yet, here this movie is.

Vin (our titular saint, and Mr. Murray) lives in an outer borough in comparative squalor. Newly divorced Maggie (Melissa McCarthy) moves in next door with her heartbreakingly skinny and good-hearted adopted son, Oliver (Jaeden Lieberher). Scott Adsit plays her cheating ex, which is jarring. Maggie works long hours and inevitably Vin slouches into the rôle of babysitter/guru/coarse grandpa. It is unbearable. Sure, he teaches Oliver the valuable skill of fighting back, but he also takes him to the races and literally steals money from him. This is not cute and flawed, this is sad and irritating. Things go even further south when Terrence Howard (who for some reason accepted a part in this movie) comes to collect the money Vin owes him.

Mitigating the retreaded agony of this horrible, predictable story is the ever-fresh Chris O’Dowd as Brother Geraghty, the theology(?) teacher at Oliver’s school. He’s surprisingly amusing in a dog-collar (though of course nowhere near his “Moone Boy” or “IT Crowd” hilarity), and injects at least some actually off-beat humor into this cripplingly banal plot. Naomi Watts as the pregnant prostitute Daka also wades into the material with a will, but it’s so clear that she’s just there to distract you from how dumb and unimaginative the rest of the movie is that she palls quickly.

If you like Bill Murray in this kind of thing, which, statistically speaking, you must, since they keep happening, well: you’ll probably like this. But if you have any interest in, say, anything new at all ever, I’d steer clear. Melissa McCarthy is still doing much better stuff than this, and, frankly, just watch “Moone Boy” again for your Chris O’Dowd fix.

Director: Theodore Melfi
Rating: PG-13 (and, man, you can definitely swear more in PG-13 movies than you could twenty years ago)
Length: 102 minutes
Score: 2/5, because at least it’s competent