I am loving the hell out of this game. I was about to spout off how far along I am, but frankly I have no idea. The completion percentage that the game gives you is based off everything, including side missions and collectibles. In that regard, I think I'm only about 30%. But I think I'm more than halfway through the story. I got the third power last night (won't spoil it for those that haven't seen it, but it's common knowledge that there's more than just Smoke and Neon). I've never played an open world game that gave you this much freedom. Sure, games like GTA have it, but you need to work a lot more to get to those hard-to-reach places. In SS, you can run straight up walls and glide for ridiculous distances, it's almost like being able to just fly everywhere.
Oh, and did I mention how amazing the graphics are? All those screenshots you've seen? They're not bullshots.. the game actually looks like that, ALL THE TIME. I've already taken more screenshots of this game that all my other PS4 games combined. I just don't have a way of getting them off the system yet (they're adding the ability to move shares to USB in the next major firmware release).