I watched this movie this past Friday with my wife and another couple. The movie was good for what it is (i.e. Christian films tend to not be great, or Gospel centered). The most important part of the film is a clear presentation of the Gospel - the character presenting is humble, the receiver (ironically, Kirk Cameron) is convicted, and the cross (not "things will get better") is offered as his only hope before God. His sin primarily a Psalm 51 confession and conversion. One has to thank God for this - especially in light of its popularity.
The acting was ok, and a little canned at times. But, what can you say, the actors didn't get paid for the work (from what I understand). If you're like me, this offers additional humor in filling in awkward pauses in the dialog (i.e. "Dad, I have something to tell you [pause]" Me: "I'm Superman." - Michelle didn't appreciate this, but my friend did.).
The setting was in typical southern neighborhood, typical southern home, typical American marriage. This made the film all to real and therefore quite sad. From my life in the south, this film hits home for the majority of marriages, Christian or not, which makes the centrality of the Gospel presentation make my heart leap for joyful thanks to God for its popularity. In my experience, the majority of Christians, southern or not, including myself, don't understand the Gospel. Nor do they understand how it applies to their lives - particularly to marriage which is the most charged relationship on earth.
Therefore, because this movie - despite it's "artistic flaws" - is clear on the Gospel and the need for the Gospel, and because it is so popular, I am thankful to God for it. Married or single, I recommend at least seeing it, so that one can therefore recommend it to needy Christians or unbelievers who would be open to watching it.