I really appreciate him as someone who offers a clear, not-too-intimidating intro to keto. (Seemingly unlike many keto-ers) I am not a very left-brained analytical type, and some of the educational videos out there in the keto-verse, while helpful, make my eyes glaze over and my attention wander when they get too into the weeds around the science of it all. I like that most of Dr. Berg’s videos are short and to the point, with easily digestible information for more right-brained types like myself. I don’t think I would have had the patience to really learn and understand how keto works, and why it is ultimately the healthiest way for humans to eat, without his videos to help guide me at the beginning of my keto WOA. That said, as I’ve learned more, I’ve strayed from some of his teachings–I don’t think all of his advice works across the board, some of his advice is too stringent or extreme, his supplements are crazy overpriced and not necessarily worth it (I did try a couple, and found the sleep aid to be helpful, albeit unsustainably expensive, and the adrenal support formula to make no quantifiable difference at all), and the man does not believe there’s a difference between coconut oil and coconut butter, which brings his credibility into question in and of itself if you ask me. 
Generally, I point folks in my life who are interested in learning about keto toward his videos, with the caveat that his free content is great and his supplements are unnecessary.
