I like the fact that there is a good degree of customization available on this camera, and being able to assign instant switching from One Shot to Servo is great, I just wish you could assign it to ANY button(i.e. the rear focus button), because the DoF Preview button just doesn't work for me(trying to hold it down pulls my trigger finger off of the shutter button). I did stumble across an article that brought "rear focus" to my attention(I feel dumb for not thinking of it myself) and it gives you basically the same results and works much better for me. You just have to retrain yourself a little if you have never "uncoupled" focus from the shutter button before.
As far as people complaining about the focus, I think a lot just haven't read the manual and played with the cam(or don't even have the cam). It's funny that KR was mentioned. I read his "review" and he doesn't know what he's talking about in regards to the focus system. I stumbled across his site about four years ago while doing research about the 5DMKII. At first I thought he was a jack @$$, but then I figured out that A LOT of what he writes is tongue-and-cheek and that he writes towards beginners and the importance of technique, de-emphasizng the importance of gear(at least that's the way I read it, because that's how he was years ago). So take what he writes with a BIG grain of salt. But there are times like this where he is just talking out of his un-informed @$$. It's kind of funny, though that he started slamming on the MKIII before he received his D800, not realizing that Nikon changed the AF selection on it(and the D4). I guess he was too busy to glance at the manual on-line before he received it.