Is DP a good role model for kids? Absolutely not, nor is he intended to be. His cartoonishly playful nature does appeal to kids, but it is the gateway to the rest of the madness that is DP. He is as Amoral as a Character gets, but is so entertaining many people, especially kids that don’t really understand him entirely, tend to not realize what he really is. The movie kicks his R-Rated side further into high gear than most of his comic depictions in the language and sex categories, and really gets the violence and naughty references pretty much on point. He is even a bad influence on one of the film’s minor characters.
The difference between Spawn, Dredd, and Watchmen vs. Deadpool is that DP is wrapped in a package that acts/looks a lot like many cartoon characters that are not as deranged as Wade Wilson. so even a kid that does know what to avoid, can be fooled by his goofy playful exterior. In the end, it comes down to whether you trust your child with absorbing this kind of material or not. How prepared are you to explain things that he does not understand? How well will he be able handle having his hero taken away from him?