Can teachers of English as a second language (ESL teachers) teach English as well as an English native teacher?

I have been studying English for 13 years and for most of this time, I am mostly taught by Vietnamese teachers. Actually, it is popularly thought that English learners should learn English with native English teachers to learn English better. However, my personal experience shows me a truth that teachers of English as a second language (ESL teachers) can also teach English language as excellently as native English teachers do.

Personally, it is obvious that both ESL teachers and native English teachers are conscientious people. Concretely, most of my Vietnamese teachers and native English teachers invest a lot of time in the process of preparing lessons before each class and always make all efforts to provide us with the most exciting and effective lectures in the classroom. For example, Mr. Bill, an American lecturer who taught us the subject of English-American Culture last semester spent much time on searching materials…