The Break-Up (2006)
I had read several good reviews of The Break-Up, so I was somewhat eager to see it. While it was certainly deeper than most movies about relationships (it really is about a break-up, so I wouldn't call it a romantic comedy), it wasn't deep enough.
Good things: the secondary characters who are supposed to be annoying really are annoying (in particular, Brooke's brother Richard, an a cappella freak, and both of Gary's brothers and his best friend); the main characters, Gary and Brooke (played by Vince Vaughn and Jennifer Aniston), actually learn from their experiences; a few of the characters (well, I can only think of one, actually) seem to know what what makes a good relationship (and that's debatable, come to think of it).
Not so good things: those secondary characters are annoying; we have to witness way too much bickering and fighting between the broken-up couple before any changes occur (and virtually nothing except still shots from their happy time together); while Gary makes big changes, Brooke seems to barely grasp her own faults, though she is the first to try to set things right by acting selflessly instead of selfishly.
The Break-Up really is a different kind of film, though. Better than most. Sometimes Gary and Brooke say so much just by looking at each other. Even though it's hard to forget Aniston as Rachel on Friends, I think she's a good actress.
And I barely recognized Jason Bateman as the couple's friend. He was also annoying, but funny.