Brett McCracken has seen Fireproof, and he writes: 

So I saw Fireproof over the weekend (as did, apparently, quite a few people: the $500,000-budgeted film earned $6 million in its opening weekend and landed at #4). I previously had no intentions of seeing the film, until my colleague Peter Chattaway gave it a surprisingly positive (3/4 star) review for Christianity Today. Having seen the trailer earlier this summer and lamenting the maudlin quality of Christian film, I had very little hope that Fireproof would be good, and suspected that it wouldn’t even be particularly watchable.

Turns out Fireproof was watchable (certainly moreso than its predecessor, Facing the Giants, which I couldn’t watch with a straight face), though by no means was it good.

I didn’t laugh as much during Fireproof as I did during Facing the Giants, and I only felt the urge to look away from the screen a few times. There were oodles of uncomfortably saccharine moments and heavy-handed digressions of overacting, but it was a huge, huge improvement over Giants. This makes me happy, but it neither excuses Fireproof for its numerous failures nor justifies it as a successful film.