It's not bad. It's fine for most people. Just to many f words for a PG-13 rating.
The film is very violent, but it comes of in a comedic way, though not intended that way.
It's not that bad of a movie. It's very mild, coming from a movie who's premise is focused around a kidnapping and torture with amputation.
It's fine for mature 14 year olds. Once your kid becomes 16, they're fine to watch it. But I wouldn't recommend it for a child who has been rescude from a kidnapping or has been raped. The torture scenes would possibly make them uncomfortable (and this is coming from someone who has been in treatment as a teenager).
What other families should know
Too much violence
Too much sex
Too much swearing
Too much drinking/drugs/smoking