Something Borrowed is an apt title for this bland romantic comedy, since there is nothing original in it. Taking its cues from other, mostly unsuccessful films, something borrowed has the added negative of having no characters we can root for. What we need is real relationships to make us feel for these characters doing things that most of us find unsavory; instead, we get unlikeable people we can't feel sorry for.
Here's the basic story: Two BFF's, Darcy, a b@#$ and Rachel, a spineless lawyer who does whatever Darcy tells her to do. In law school, Rachel falls for Dex, but he ends up going for Darcy. The Double D's are now planning their wedding, but when Rachel finally tells Dex how she feels about him, they end up sleeping together, and the dilemma begins: Rachel or Darcy? Really, the answer is simple: neither.
I like to relate to characters in a movie on SOME level, and here, I couldn't do that. Every time one of them looks like they might do something remotely realistic, the screenplay has them do something completely opposite. When Rachel and Dex sleep together, you almost want to feel bad for Darcy (that's hard to do), but she sleeps with someone as well, so there goes that conflict. The filmmakers do everything they can to deflate whatever tension or drama might occur. John Krasinski is the only thing worth watching in the movie, but not for the amount of money you have to spend to sit through the rest of this garbage.