These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Anvilicious: The religious message is not terribly subtle. Deleted Scenes show that original plans may have had it even less subtle.
Critical Dissonance: Mainstream secular critics generally panned the film, but it made a very impressive $33 million on the back of a $500,000 budget. Related products (such as the website FireproofMyMarriage.com, advertised in the credits, and the "Love Dare" book) have been similarly financially successful.
Padding: Most of the scenes involving the firefighters have little, if anything, to do with the main plot of the film, and seem there only to pad out what is at its core an hour-long TV movie to a two-hour theatrical release.