What you are doing right and the others aren't is two fold.

First of all, you have a progressive series. A person can actually start from the beginning and work their way up to a conversational level. All the words are accounted for. You remind people of what is new and what has been covered already. You remind them in Chinese and use English sparingly.

This is the way that it should be done. After the initial stages, a language should be taught in the target language as much as possible.

The second thing – Lessons are introduced in Chinese.

I started listening to your podcast when you first started, maybe a week or two behind. I just returned from China. Your lessons helped a lot. I gave listened to a lot of Chinese lessons and I really like yours. I like the way you describe each individual words with literal translations. I did not realize you just started learning 3 years ago until today when I heard the lesson. What I like about your lessons is your precise, deliberate pronunciation of each word.