I browse this website quite often since 2012. I have never seen so many negative comments about Canon these days in comparison with before.
Does Canon really not satisfying its customers lately or is it that there are new members in the forum who like to put down Canon in comparison with other companies?
I am a very satisfied customer. I also think canon has set he pace and innovated in other ways besides the sensor. I do hope to see sensor improvements in the next xD body, especially in low ISO read noise. But, that said, my 5DIII is so amazingly good. It is a better camera than I am a photographer. Sure 3rd party lenses are getting better, but Canon is releasing some interesting lenses and I am happy to have competition. But this year alone Canon has released 3 lenses I am considering adding.
I've been around CR since 2010. I actually don't see the switch in the negativity you mention. This site has always had a very healthy dose of criticism and negativity. There have been a few more conflicts over the negativity as I believe certain people are getting fed up with it. Before, it was often unopposed. And perhaps the negativity has manifested itself more specifically on the sensors (mostly) and mirrorless (lesser). But the most positive response I can think of to a Canon dSLR from this site was the 7DII. The 6D was absolutely shredded here. Delays in the 1DX, Big White lenses, etc too. The 5DIII, a complete disappointment and minor upgrade at best over the 5DII which would result in waves of defections to Nikon and the D800 if you were to read the original threads on CR.
There is some very interesting content on this site. But I guess I disagree with your premise. To me, the interesting content is actually growing more frequent.