Blade Runner is the first movie that made me appreciate human like "monsters". When scifi/horror/fantasy used to come up, and had the hunting monsters trope in it, when I would watch a film and find out it had no monsters, I'd be so f**king pissed off. 13th Warrior is a prime example of this. I realize BR came out before, but I saw it much later. In 13th Warrior, when you are first watching it, expecting them to fight big bear humanoid monsters, and find out they are human in the first silhouette that you see them in, your like wtf, what a disappointment.
BR made the replicants interactions with decker so off the f**king wall, and different than a typical encounter at that time in scifi film with such adversaries, that I began to look at it as plausible.
I'd eventually go back and watch 13th Warrior (and read the book) and the film would end up on my all underrated movie list.