There's something about Steve Carell portraying a sad sap in love, who's fighting / pining for his woman that really does it for me (see Dan in Real Life; Date Night). It's a formula that works for him, so hey, if it ain't broke, don't fix it.
One item of interest from the trailer, it appears that Steve is once again being upstaged by a man without a shirt on. In "Date Night" it was Marky Mark (Wahlberg), and in this movie it's Ryan Gosling. It's enough to give a poor guy a complex.
