‘Mike and Dave’ need a better movie

Starring Zac Efron, Adam Devine, Anna Kendrick and Aubrey Plaza. Directed by Jake Szymanski.

Rated R for crude sexual content, language throughout, drug use and some graphic nudity. Check listings for theaters. 1 hour, 38 minutes.

Bottom line: Wildly uneven and the lows outweigh the highs.

Although the premise is spelled out right there in the title, “Mike and Dave Need Wedding Dates” makes very little sense. That’s despite it being (shockingly) based on a book. Well, a “book,” written by brothers Mike and Dave Stangle as an obligatory cash-in on their viral Craigslist ad.

But even though the opening credits claim that the film is “inspired by the life stories of Mike and Dave Stangle” and also “based on a true story… sort of,” somehow the movie version has absolutely no connection to reality.

That’s OK — sex comedies shouldn’t necessarily resemble real life. But the film doesn’t even convincingly craft its own internal reality in this story about a pair of rowdy brothers who end up with an even rowdier pair of dates to their sister’s wedding. There are no rules or character motivations, words come out of Zac Efron’s mouth when it isn’t moving, and Anna Kendrick’s wig changes color seemingly at random.

The script is by Andrew Jay Cohen and Brendan O’Brien, who adapted the book, and is a disappointing nosedive after Cohen and O’Brien’s “Neighbors 2: Sorority Rising.” It’s directed by Jake Szymanski, who has a host of Funny or Die shorts and the HBO tennis comedy “7 Days in Hell” under his belt, but “Mike & Dave” doesn’t prove that he can handle multiple storylines that are intended to stretch beyond a few minutes.

This movie will leave you with many more questions than answers. Such as: If Mike and Dave ruin every family party, why would their family think asking them to bring dates is going to remedy the situation? That’s literally doubling the trouble. Furthermore, why do drunken train wrecks Tatiana (Aubrey Plaza) and Alice (Anna Kendrick) want to be their dates? Sure, it’s a free vacation to Hawaii, but they have to go to great lengths to convince the guys that they’re “nice girls,” when they’re actually mentally unstable drug addicts. And after all that, why do they quickly and cavalierly confess their lies halfway through the movie, fizzling out all the tension?

Efron usually lifts everything with his sweet stupidity, but he only gets a few moments to shine as Dave. Adam Devine, is vein-poppingly intense and ridiculous as Mike, and squeezes in a laugh or two when he’s allowed to be his weirdest. There are some comic high points: Alice Wetterlund’s butch bisexual cousin Terry is second only to Sam Richardson, as the groom, who knows no equal when it comes to playing endearingly nerdy fussbudgets. But on the wildly uneven rollercoaster that is “Mike and Dave Need Wedding Dates,” the lows far outweigh the highs.