He was massively underplayed in Arkham origins (that disappointed me, as he was shown off so much in the trailers) and Injustice, I feel he should be in the JL Movie. Why? Well he's kicked Batman's ass many times in canon, even managed to beat the flash. Hell he also managed to beat super girl. [url=http://static.comicvine.com/uploads/original/4/41224/1787038-deathstrokeflash.jpg]Him beating flash[/url] and [url=http://dailydoseofcomics.com/files/2011/08/Deathstroke-vs-Supergirl.jpg] him beating supergirl[/url] He'd be good as a "secondary" or villain, like how scarecrow or Two face are in the Batman movies. Villains, just not the main one.