What makes Deadpool work is not the ability of the characters to go to strip clubs or drop F-bombs at any time the script writer deems it necessary. It is the gritty humor and bent point of view that makes the movie and the comic work. Deadpool, the character, is a killing machine and it is this violence that would probably keep the movie out of the PG-13 range because there is a huge difference between a comic book drawing and a live action flick. Deadpool, the merc with the mouth, has in both movie and comic something unique. Deadpool is aware that he is in a comic book. Unlike his first movie appearance in Wolverine Origins, the movie often is more of a true origin story. Deadpool, being aware of his fictional status, in fact, takes aim at that movie as well as Ryan Reynold's other super-hero failure, Green Lantern. Them movie actually works because it has so much fun with other Marvel franchises especially the X-Men series. It is this moment to moment humor that makes Deadpool so much fun. There are also plenty of more adolescent gags that would be ripe for a PG-13 version of the film, but at times were a bit out of place for the more adult themes of the hard R.
I liked it and will probably buy the DVD.