Sorry, but a rated R comic doesn't mean squat, that doesn't make Jessica Jones or Luke Cage a rated R character, the only rated R character from that team..is the The Punisher, but there's just one problem, is not that popular among the adults...and his movies proves i'm right! here..
http://www.boxofficemojo.com/movies/?id=punisher.htm
Most of you even claiming that Punisher was the first antihero, sorry but Punisher its a psychopath not an antihero, antihero means it kills people.. ha ha, most of you clearly don't know what antihero means! and if you trust Wikipedia your even more $$$$ than i thought! Back in the 70s Antihero meant "anti superhero" it all began when Wolverine made his first debut in comics as a superhero with attitude..fighting another superhero "the Incredible Hulk", from the start he was renamed as antihero, governments instead of working with vilians.. and getting to dirty, Wolverine was their better choice, because the government just wanted to eliminate the target without any other casualties. But now antihero it cant no longer be described in two words, you have to do more research on Wolverine if want to know right definition on what antihero means today.
The ones are popular and rated R are Batman, Wolverine, Deadpool, X-Men and Blade, while the Punisher and The Watchmen are rated R but not popular.
If DC makes a Batman a rated R movie will open doors for other superheroes like Superman, don't you want that? or do you really want to continue making bad decisions..Like they did with Watchmen?