La Bamba is a perfectly adequate biopic of fifties rock and roll singer Ritchie Valens, who died at seventeen in a plane crash. Very twenty-five year-old Lou Diamond Phillips plays Valens. He’s adequate. He lip-synchs all right, though the performances (Los Lobos covers Valens’s songs) almost never sound right acoustically. When Phillips shows off his skills to his garage band, for instance, it clearly wasn’t recorded in a garage. But whatever. It’s perfectly adequate.

Ditto the supporting cast. Esai Morales is Phillips’s older half-brother, who’s narratively responsible for everything in the movie–he moves Phillips and mom Rosanna DeSoto (who’s obviously way too young to be their mother) from a migrant community in Northern California down to the Los Angeles area at the beginning of the movie. He brings Elizabeth Peña along too. Peña was Phillips’s love interest before Morales arrives. One look at Morales, however, and she dumps the ostensibly younger Phillips. By the time the film’s jumped ahead after the move, Morales is an abusive drunken pot runner.

Despite bookending the movie and being responsible for so much, Morales doesn’t get to do much. No one really gets to do much in director Valdez’s script, of course. Morales has amazing illustrating abilities, which La Bamba promotes into a second act subplot to apparently fill time, because it goes nowhere. It’s a vehicle for Morales’s eventual breakdown about being jealous of Phillips. It’s a dramatically inert breakdown; it’s fairly clear early on no one’s going to give a standout performance or have some amazing part. Sure, Morales has more to do than almost anyone else, but Valdez doesn’t give him anything. Valdez also isn’t great at directing his actors.

He’s adequate. Enough.

Besides Morales and Peña (who really gets squat), DeSoto doesn’t have an arc outside being Phillips’s fiercely supportive mom. She has three younger children she’s raising, who she never has any significant scenes with. Or even insignificant ones with the baby, who disappears after a while. Then there’s Danielle von Zerneck as Phillips’s girlfriend. Her racist dad (Sam Anderson) doesn’t like her dating a Hispanic kid, though it’s never clear the dad finds out he’s Hispanic just brown. He eventually has problems with Phillips for playing rock and roll more than anything else.

von Zerneck and Phillips have no chemistry but muscle through their subplot–it’s barely a subplot, she’s a narrative prop–all right. The period costumes and cars do some of the heavy lifting; Vincent M. Cresciman’s production design is good.

Joe Pantoliano is similarly fine–and similarly a narrative prop–as the record guy who discovers Phillips.

Valdez’s direction, outside his disinterest in his actors’ performances and some blocking issues cinematographer Adam Greenberg really should’ve corrected, is… you guessed it… perfectly adequate. When Phillips finally performs the title track, the scene’s more effective than usual but only because, well, it’s La Bamba. It’s a great song.

Unfortunately La Bamba, the movie, is lukewarm. And really, really comfortable never being anything but.