Friends With Benefits has a fairly uninspired plot. Two twenty-somethings, Dylan (Timberlake) and Jamie (Kunis), decide to start a purely physical relationship after being dumped for being either emotionally absent or emotionally guarded. This being a romantic comedy made in Hollywood, you know how the entire story unfolds from the premise alone: one develops feelings for the other, they break up because of a mistake one of them makes, and eventually get back together and live happily ever after. Like it or not, that's the formula you're buying with your movie tickets.
Fortunately, this movie is probably the smartest it could have been given that preordained scenario thanks to pristine execution and delivery. The dialogue is sharp and witty, the acting believable and emotionally fulfilling (unlike the characters themselves), and the mood is appropriately adult (plenty of nude butts and four-letter words). I was surprised at how much I bought the film, which I think is a testament to the directing and the acting. I actually felt the emotions that the characters were going through, and to me that means the movie has succeeded. So despite the predictable plot, despite occasionally feeling like the simple message was beat into my head, I don't think there's much higher you can aim for in a film.
IMDb link: http://www.imdb.com/title/tt1632708/