People don't give GTA V enough credit I feel.
There's so much going on in the game that it's just crazy. All the flyers, the graffiti, billboards, etc. The conversations that NPCs have with each other, on the phone, etc.
Hell, most companies can't get reflections right in something like an FPS. In GTA, you can park your car on the curb, get out and look at the rims, and see a reflection of whatever building you're across from.