I learned next to nothing from this course; the professor just rambles on and on jumping schizophrenically from aspect of aspect. One moment he's talking about physics, and in the same sentence he's suddenly talking about whether the game should have a crafting system. Some of the information even seems out of touch.
He doesn't state any information with certainty because he always tends to add "or not!" or "...maybe!" after sentences, leaving you to wonder if there's anything left to take away from the lessons. The entire course could be condensed down into a "list of questions to think about while designing your game world" - it really doesn't contain anything more than that.
Sometimes entire segments are dedicated to trivial things (such as "your game could have invisible walls!"), whereas in other segments he works through a hundred different questions without going in-depth to any of them.
Speaker is hard to understand due to his lack of proficiency with the English language and the subtitles are often incorrect.
On the plus side, you will learn what a "ha-ha" is.