From a marketing standpoint, in my professional opinion, All you Need is Kill makes no sense as a movie title for the original, as it says nothing about what the movie might entail (Yes I know there was a lot of killing, but that wasn't the point of the story). The point is for the title to actually have something that alludes to what's going on in the movie, because the now shorter-than-it-used-to-be attention span of the average movie viewer would see that and go "huh?"...
I wholeheartedly agree that AYNIK is very edgy, but not having any reference as far as the original novel goes, I'd be completely lost unless i'd seen the trailers or was a big Tom Cruise fan. Edge of Tomorrow is very safe, descriptive (Ooo! Timey Whimey!) and very "popcorn fun," which is what that movie was.