For anyone that enjoys the single player experience and the world, and doesn't run through everything just to rank up and get loot.

Take your time to explore and have an open eye, the amount of small details and little things there are just astounding. From things like walking through deserted roads and looking up to see some people and movement in the apartments above you. Examine graffiti, wanted posters. Listen to the neighbourhood chatter from civilians. The game has been realised so beautifully, the art department has really done a phenomenal job!