When a book starts with, “this is my version or interpretation of a classic text,” there’s little that you can say about it.
My Gita is a broad and encompassing interpretation of The Bhagvad Gita, including Hindu philosophy, a bit of comparative study of religions, history, and social structure. It is a non-linear book, so to speak, in that it does not follow the sequence of the chapters as outlined in The Bhagvad Gita. Devdutt Pattanaik, creates his own sequence, for good reason — telling a story (which he usually does).
If you have studied The Bhagvad Gita before, there will be instances, where you may cringe a bit; but you remind yourself, it is his take. If you know little about The Bhagvad Gita, this is a good read to gain a broad context of the book, contemporary life & times, and an idea of the philosophy that is now commonly called Hinduism.
The only risk, I felt, as I read through this easy read, is that if the reader was left with an impression that he or she has a full understanding of The Bhagvad Gita, after reading My Gita. For obvious reasons, there is simplification, and The Bhagvad Gita is much more than what you will read in this book. Perhaps the author should have stressed, at the end of the book, for the reader to read (not just a list of suggested reading) the original text.
Do read, but do not stop your study, with this book.