I'm surprised more people don't love this villain.
In terms of adapting Apocalypse into the "real world", they pretty much nailed it.
Oscar was EXCELLENT in this role. Just the perfect balance of comic book supervillain and subtle threat. His charisma came through GOBS of makeup, and he gave a fantastic, subtle performance all things considered.
Visually, he looked just ridiculous enough, but still kind of sci-fi cool. I really liked the evolution of his voice from a soft, soothing whisper to that threatening techo layering. Some great dialogue for Isaacs to chew on, and some great simple, straightforward lines as well.
His powers were well done, as well as the "manipulation" of his Horsemen. I thought his themes were handled well, and his motivations were clear and evolved well from scene to scene. Certainly a better overall villain than Shaw, and in many respects, Trask. He's not Magneto, but he might be one of my favorite comic book movie villains moving forward.