"Your Sister's Sister": Reviews are in

Emily Blunt as Iris and Rosemarie DeWitt as Hannah in Lynn Shelton's "Your Sister's Sister."

/ IFC Films

(CBS News) "Your Sister's Sister," the unconventional romantic comedy starring Emily Blunt, Mark Duplass and Rosemarie DeWitt, opens with limited release today and already it's a hit with the critics.

The film about ever-complicated relationships that mixes drama and comedy received mostly positive reviews, scoring an 85 percent on Rotten Tomatoes.

Here's what some of the critics had to say:

"Very little is simple in 'Your Sister's Sister" - not the emotions, the naturalistic tone or the unstudied, easy going performances. But the film's pleasures are. It's a tribute to Shelton [The film's director and writer Lynn Shelton] and her cast that they've made a film about the difficulties of love, friends, and family look so easy," writes Washington Post critic Ann Hornaday.

"Unfortunately the easygoing mood does not last. The film's late swerves into melodrama and the neighboring region of farce feel panicky and pandering. The subtlety of the performances -- Ms. DeWitt's in particular -- is sacrificed for easy laughs, shallow tears and a coy trick ending. Just when it was starting to get interesting," says New York Times critic A.O. Scott.

"Also by perhaps one too many unlikely betrayals in the final reel -- but by that time, audiences will likely have been so seduced by the film's spontaneous wit and understated charm that only the really churlish will object," wrote NPR's Bob Mondello.

"[It] was shot in a mere 12 days, on a budget that must have been minuscule. A couple of minutes after it's started, though, you know you're in the presence of people who will surprise and delight you," writes Wall Street Journal critic Joe Morgenstern.

Tell us: Are you planning on seeing "Your Sister's Sister"?