I don't get it why should anyone be jealous of Ken Rockwell, as you've stated he voices his opinion that doesn't mean that his opinion is always correct though. A lot of things can go wrong with older tlr's that has little or nothing to do with the lens and more with correct alignment of the taking and viewing lens or the groundglass position. The Mamiya TLR though not as good as the Rolleiflex was used by many pro photographers who have nothing but good things to say about the system. So in this context the Ken Rockwell's opinion should be seen as what it is a personal opinion amongs many other opinions.
I also admit that Rockwells site can be very informative and entertaining but would I base my lens or camera choice on his site alone no. Would I recommend it for information gathering purposes sure.