I enjoyed the blog mostly due to MMM's style of writing and passion for the topic, not even so much for the topic itself. He could write about paint drying and I would probably find it interesting.
However, for me, it kind of jumped the shark with the "Staying Fit with no Gym In Sight" article. He made some claims that were easily debunked in the comments and his response was that he just didnt really want to take the time to research it before posting. I completely get it - blog posts are a lot of work, but it was disappointing.