Regardless of what the film’s title may suggest, Ned (Paul Rudd) isn’t really an idiot. It’s just that his brutal honesty is perceived as stupidity. And that’s where screenwriters David Schisgall and Evgenia Peretz find their hook in Our Idiot Brother, a film directed by Jesse Peretz. It explores what might happen if a very open, laid-back brother were to suddenly come back into the immediate lives of three type-A personality sisters. Through Ned we learn that ultimately, sincerity and honesty will win out over a world overrun with deception and ruthlessness.

Ned’s sisters, Liz (Emily Mortimer), Miranda (Elizabeth Banks), and Natalie (Zooey Deschanel), have all left the nest, started families, and found individual careers. But Ned, a well-meaning, this-generation hippie has failed to launch. He’s spent the last three years living on a biodynamic farm with his girlfriend (Kathryn Hahn) and their dog, Willie Nelson, and the last three months serving a stint for selling weed to a cop. Not an under-cover officer mind you, but a policeman with a uniform and badge.

To say Ned marches to the beat of a different drummer is akin to proclaiming that Michael Jordan was a good basketball player. But it’s not so much the odd drumbeat Ned’s following as it is the high-strung life and competitive nature of his neurotic sisters he’s escaping. He’s made the choice of -- or perhaps has just naturally gravitated toward -- a life of less cynicism and with more faith in humankind. He figures that even if someone is taking him for a ride, giving them his full trust might challenge them to live up to a higher standard. But in a world that doesn’t always operate on a system of good faith, Ned seems sure to run into a few hitches along the way.

Upon leaving jail, Ned finds himself back at home on Long Island with his boozy mom (Shirley Knight). Eventually he heads for Manhattan to restart his life while taking turns living with each of his sisters.

First, there’s the eldest, Liz, a harried wife and super-mom who has kind of let herself go. While working with Liz’s husband Dylan (Steve Coogan), Ned discovers that Dylan’s having an affair. Then there’s the middle sister Miranda, a reporter with Vanity Fair who jeopardizes her blossoming journalism career by running with a story based on information she gleaned from Ned’s personal conversations with an interview subject rather than from her own interviewing prowess. Finally, Ned blabs out that his youngest sister is pregnant, in spite of the fact she’s supposed to be in a monogamous relationship with her life partner, Cindy (Rashida Jones).

More clever than laugh-out-loud funny, the comedy here is mostly driven by our observations of Ned, who can’t help screwing up the lives of his sisters one-by-one, despite his good intentions. Though he means well, Ned drives everybody crazy with his innocently laconic mouth. He’s one of those naive bumpkin-in-the-city types who would have been played by Jimmy Stewart back in the day. While Rudd is certainly no Jimmy Stewart, his straight-man trademark feeds well into his altruistic Ned.

We must also give screenwriters Schisgall and Peretz credit for some of the film’s success as they avoid painting Ned’s unfortunate situation with a broad brush of low-ball humor and tactless vulgarity. Instead they opt for letting Ned’s family conflicts play out as a natural clash of differing personalities. Anyone with siblings can certainly relate. As a result, we don’t hate Ned’s sisters for the poor decisions they’ve made, but rather sympathize with them for being victims of forces mostly outside their control. We see some of ourselves in Ned’s sisters.

The story comes together quite nicely with all the plot machinery working in unison toward its final act where we discover that the joke is not on idiot Ned, but rather on us, the urbane, ambitious, career-oriented rats whose cracks are gashed wide open by the likes of Neds everywhere. They tend to make us want to blame those closest to us for our own screw-ups in life. Ned isn’t an idiot. He’s our brother. We’re the idiots. But isn’t it a warm and genuinely funny ride to find that out?

(Released by The Weinstein Company and rated “R” for sexual content including nudity and for language throughout.)

Review also posted at www.franksreelreviews.com.