I'm so glad I saved this game for next gen. It looks awesome on PS4. Out of the three games I've got (AC4, Killzone, Madden), I think it looks the best. And the game is like crack. I've played all the big games this year, and I'd put this in the top 3 with Ni no Kuni and TLoU. There's so much fun stuff to do in terms of side quests and things, and the open world is huge when it opens up.
Having an absolute blast with it!