Someone at Rockstar HQ is absolutely terrified of silence. Between GTA IV, Red Dead Redemption, and now this, I've never heard so much annoying, pointless chatter.
Anytime you have to drive somewhere with someone, walk somewhere with someone, or spend any time around a character in this game, you can count on them to talk non-stop, about absolutely nothing. It doesn't advance the story, it's just, for example, a redneck telling you for the tenth time that he doesn't have an education, and you make him nervous.
And the dialogue is the one audio option that cannot be turned entirely off.
The writers in the GTA series have always been bad to the point of embarrassment, but at least you can skip a cutscene. Apparently the idea of the player missing out on their genius is intolerable to the developers, though, because they crowbar their idea of wit into literally every empty space,
If you've ever had a friend who was one of those people who got nervous when everyone got quiet, and would just start yammering into every empty space in a conversation, playing this game is exactly like that.
I'm giving the game a 6, down from a 9, because even though it's fun, there are MANY times when I want to scream at my TV to shut the eff up for five effing seconds.