Ken's site is great. I don't like his photographs and I often disagree with his opinions on gear, but he's very consistent and knowledgable. I always check to see if he has a review before I buy a new lens or body, especially if it's film.
Maybe I'm too distracted by the formatting of the website. I find his pages to contain ridiculously large size photos that make the article hard to read. No tables or organization of information in a consistent way (or across lenses, cameras) that makes comparisons or reading easy. Very hard to tell if he's actually expert at something or his credibility. All of his observations are just qualitative (as is any typical amateur enthusiast camera website).
I much prefer DPreview.com's reviews of cameras and lenses.
