Something truly exceptional has to come out to beat Bloodborne as the best exclusive game on the PS4 as far as I'm concerned, as I consider it the best game of the generation as a whole. Horizon is #2 right now as far as exclusives go, though there are quite a few that I haven't yet played like God of War and Spider Man. As far as future games, FFVII, TLoU II and Ghost of Tsushima are the most interesting in my eyes.