I know Mike reasonably well; in fact, he's the first person I ever co-GMed a game with. In my opinion Mike is blazingly smart, extremely prolific, moderately opinionated, and a little more stubborn than I am. He's also tremendously imaginative and has a solid grasp of "fun". He's not afraid to challenge existing paradigms just for the sake of challenging them, which I think is what we see in the monster re-imagining articles. I don't always agree with his opinion, but I respect it.
As for that Keep on the Borderland review, from back in '99? Anyone who is reading that without their tongue firmly planted in their cheek is missing the point. Note the sarcasm and the tags - "comedy" - and for me it becomes clear that it's not intended to be a real review. It is intended to make a few hyperbolic points about the module's flaws.