I've had the 6D for several months now, and I love the camera. I think the 6D's target market is probably not people who previously owned the 5dII, that is what the 5dIII is for, but instead for those who want to jump from a crop sensor to full frame like I did. I went from a t3 to a t3i to a 5d classic, and now I have my 6D and I couldn't be happier.
I think when you make that jump, unless you are coming from a 7D, the autofocus doesn't seem to be that much of an issue, and in most cases, its an improvement from what you had previously.
The one thing that I don't like on the 6d is the GPS and how you have to turn it off when you aren't using the camera. It will drain the battery to nothing. There have been times I've pulled my camera out and its dead. I'm used to switching it off now, but it seems like the camera should go into some type of GPS sleep when it hasn't moved or it can't get a GPS signal, but it doesn't do that. Even with it turned down to the least frequent settings, it is still firing when the camera is off and draining the battery. I'm sure this could probably be fixed with some type of firmware update, so hopefully Canon does that soon.
Beyond that, I love the camera. It takes beautiful photos, and has a great size for me, not as big or heavy as the 7d or 5d mark III, and it fits my hands well. As for price, its a great value, I bought the kit, sold the included lens, and my total price ended up at less than $1600.