It makes him feel important, in his own little egotistical mind. (just my opinion)
Mikael popped out of nowhere and started to make many posts about Canon sensors in this as well as Fred Miranda forums. He is either a kid having fun on the internet or a truly disgruntled owner of several Nikon/Canon/Hasselblad/Leica products.
In any case, even though I doubt he has any factual evidence to back his assertions, I feel that it is not necessarily a bad thing to repine about Canon sensors. It's the same with DXOMark: full of garbage but some of their basic (not projected or opinionated) findings are correct. Canon ought to step up their sensor technology especially with regards to their low ISO dynamic range.
The problem is this: does any of this whining get to Canon management and do they have the means to solve it?