As predicted, the servers are ****ed, you can't even complete the single player tutorial mission that allows you access to the basic functions. Which by the way is complete bullshit, I've completed two saves on over 75%, I think I know how to drive a car.
I was expecting this, but Rockstar could have made it much easier on themselves by staggering the launch, maybe making it midnight release in each time zone so that the load was spread out. Also perhaps checking your single player save, and assuming you know the basic functions if you've completed the game.
I'm going to leave it until tonight before trying again.