They say you can't help who you love, and people have used that line forever to make terrible decisions about romance. This movie explores the idea that while you might not be able to help loving someone, you can still choose how you respond to that feeling. Choosing wisely is the difficult part! :) The characters (and not just the main characters - there are some great sub-plots and well-rounded side characters here) learn a lot about being realistic (and how & why that can be difficult) when it comes to romance. Many aspects of this theme are played out, and in more ways that you'd think just from reading the back of the DVD cover.
I highly recommend this if you like that class of chick flick that goes beyond the obvious to ponder some of the deeper questions about love and the things we do to find it, keep it, and occasionally break our hearts over it. Like other beautiful movies of this kind (eg, While You Were Sleeping, French Kiss) the comedy is fairly subtle and character-based.
All the elements are there: casting, direction, script (story and dialogue) and acting are all good. I hope you enjoy this movie as much as I did!