Batman has the biggest rogues gallery of the DC Comics superheroes, and certainly one as large as Spider-Man’s, if not larger.
Deathstroke, however, is one of the few who hasn’t gotten his due yet.
Slade Wilson has been played on live action TV twice in the last decade: by Michael Hogan on Smallville and by Manu Bennett on Arrow, with the latter earning praise for his performance.
With eight live action movies (nine if you count Suicide Squad, which had Batman in it, but wasn’t focused on him), a significant number of the Caped Crusader’s enemies have been adapted for the big screen; some of them more than once, like Joker, Catwoman and Bane.