Isn't trying to use the argument:
-"They're wrong because Canon actually sell quite a lot of cameras"
Actually, the argument is, "They're irrelevant (or at least, not very relevant) because Canon sells quite a lot more cameras than their competitors who score much higher in DxOMark's rankings."
The DxO "scores" are in no way to be mistaken for "reality". They are what they are, an end sum of an arbitrarily weighed set of measurement points that in their constitution may (or may not!) in some way be representative of how you as an individual use your camera.
I could not agree more. This was what I was driving at, initially. At the time I originated this thread, there was a plethora of posts/threads proclaiming the superiority of the D800 (and other Nikon bodies) as cameras because of the DxOMark scores, and nearly as many posts/threads suggesting that Canon was doomed as a corporate entity because of their subpar sensors. The former claim is clearly unsupported by DxOMark, and the latter claim is equally untrue.
Thanks, TheSuede, for your cogent post.