Consistently amusing but never uproariously hilarious, "We're the Millers" mainly decides to play its fun premise relatively safe by gently subverting our expectations of Jennifer Aniston and Emma Roberts while making first time leading man Jason Sudeikis a more prominently featured actor and rising star Will Poulter the laughingstock of many scenes. There's just enough rude humor to keep fans of adult-oriented comedies satisfied, even if the film continually reveals a clichéd underbelly of sentimentality. But hey, at least it's fun while it lasts. The chaos begins when sarcastic small-time drug dealer David (Sudeikis) is robbed, leaving him indebted to his supplier Brad (Ed Helms). But he's soon offered a way out: travel to Mexico and collect a big shipment to smuggle back across the border in an RV. To increase his chances of getting through without an inspection, he creates an on-the-spot fake family from his strange neighbors: desperate dancer Rose (Aniston), lonely geek Kenny (Poulter), and streetwise tough girl Casey (Roberts). And the fact that they continually struggle to act like a convincing family is the least of their problems as they're chased down by a couple of vicious goons and befriended by an uncomfortably friendly couple (Nick Offerman and Kathryn Hahn) along the way. Yes, this is basically one of those road trip comedies in which something "unexpected" happens at nearly every turn. Sudeikis rides out the entire film relatively unruffled, while Aniston's big scene is a scorchingly over-the-top "dance number" performed to distract a drug kingpin. Roberts' only subplot is a blandly forgettable liaison with a moronic skater. These sequences are carefully calculated to be mildly funny but never embarrassing to the stars. On the other hand, I think it's mostly safe to say that Poulter walks off with the entire movie. From an awkward romance with another girl (Molly Quinn) to kissing practice with his "mother" and "sister" to a ghastly spider bite, he terrifically dives into his humiliating scenarios with gusto and enthusiasm. Director Rawson Marshall Thurber (whose last big film was 2004's "Dodgeball") keeps the story moving at a snappy pace, giving his actors lots of space to play their roles (the outtake reel in the closing credits shows how much fun they had). So even if the comedy consistently pulls back from the brink of genuine anarchic hilarity, it at least elicits the occasional chuckle or knowing grimace of sympathy. We never once doubt where the story is heading, since it clearly has one of those tidy plot structures that won't leave any narrative threads dangling. So in the end, the warmhearted sappiness isn't much of an actual surprise. And the movie ultimately becomes an enjoyable enough diversion, but never a true guilty pleasure. Still, if you're just looking for some mindless comedic entertainment, "We're the Millers" will satisfy all but the least demanding viewers. At the very least, it's worth a watch.