The point is, many of the people criticising the 5D MkIII and lauding the D800 (and even the currently mythical D600) haven't used either. It's like me saying that Lamborghini's are better than Ferrari's, I haven't driven either and am never likely to. I have used the 5D MkIII and was impressed, but I haven't tried the D800, although I'm sure I'd also be impressed with that.
A lot of it is down to what features you as a photographer need. If you need high resolution, then get the D800 (if you can afford to switch), if like me, low light performance and faster frame rate is more important, then go for the 5D MkIII. To keep on going over the same ground, griping about the price and supposed quality of one camera over the other, especially when you haven't even tried them is pretty pointless and eventually with any luck, most people will stop listening. Perhaps it would be an idea for some people to look at the photos in the gallery section, rather than complain about how other cameras are lacking something. There's even a thread showing what cheap equipment can achieve, with much lower specs than either the 5D MkIII or D800.