This isn't an awful film, it's just very, very weak. It deserves its obscurity.
Radha Mitchell's character, JoJo, is a total Manic Pixie Dream Girl. She loves to crash weddings and attends one every week! How whimsical and charming! Like most Manic Pixies, JoJo sweeps forcefully into the hero's life and teaches him about life... and himself. There's not a single thing about JoJo or her relationship with Adam Trese that rings true. And most of the first act is given over to this unconvincing character and relationship. (A later revelation about JoJo that explains some of her oddness seems awfully forced.)
When the focus shifts to Trese and Kirshner, things pick up a little, but only a little. To give you an idea of the level of plotting here, Trese and Kirshner meet when a group of threatening guys get pushy with Kirshner and a friend, and Trese steps in and gets beaten up protecting them. It's ridiculously contrived.
And while JoJo is the least believable character, none of the characters seem authentic. Trese is apparently a lawyer who dreams of being a cowboy, but all this seems to mean is that he wears suits at work and cowboy hats in his spare time. Kirshner is cute, but who is she? Who are any of these people? Good romance is about unique relationships between distinctive, believable characters, not 2-dimensional "cowboys" and "angels."
On the plus side, Radha Mitchell and Mia Kirshner both look beautiful. They're not overly glamorized, just healthy and glowing and gorgeous. And the relationship between Trese and Kirshner develops sweetly, if you make it that far. The country music on the soundtrack is pleasant enough, but there's a repeated music cue that rips off the Enigma sound and seems really, really out of place.
I guess if you want a wholesome romance with a focus on weddings rather than cussin' and sexin', maybe this will work for you, but if you like good movies, look somewhere else.