...do his concerns hold any water? What's the answer to the following for example:
"I'm still trying to learn the extremely complex AF system of the 5D Mark III. I still can't figure out a fast (one-click maximum) way to get from the auto-AF area select mode to a single selected area. I always shoot letting the camera select the AF point, and need instant override to select the point if the camera can't do it itself. Right now, I have to press the Mark III's [-|-] button and then press the M-Fn button a few times, an then move the thumb button, which is completely unacceptable unless I can find a faster way."
His concerns seem, to me, to be incapable of holding even hot air.

But for this particular brass tack, I don't have a 5DIII, but on my 7D and 5DII if the camera happens to be in automatic AF point selection mode (which it never is, because the 'mind-reading AF selection mode' hasn't been invented yet), pressing the multi-controller straight in changes to manual selection of the center AF point, and then it can be moved from there. KR implies that can't be done with the 5DIII, but the manual seems to indicate he's mistaken (about a great many things, cue Emporer's voice from Star Wars). Alternatively, you can register an AF point, and assign a button to that function.
A couple of my favorite points from KR's...ummm...review (and I use the term
very loosely):
"
If it was significantly different, Canon would have given it a new model number, instead of a "mark" appellation." Right, because KR didn't say the 5DII was far better than the original 5D (oh, wait, he did).
"
AF is much more complicated, not necessary better than the original 5D and 5D Mark II." Ummmm, ok, sure...it's no better than the 5D's AF. By extension, neither is the AF of the 1D X. Ok, Ken, fine.
...and my personal favorite:
"
Foolish RATE Button Clutter" A Nikon shooter, complaining about 'button clutter' on a Canon camera. I actually LOL'd when I read that heading line...