I don't think I am that great a GM but I have Kronshi who is just an amazing Co-GM. I seem to be okay with Co-GMing things because it is more about answering questions, giving ideas, working things out to what the GM has in mind and such. As a GM...I am kind of a ditz and miss things or details and need to be reminded/questioned lol I love doing it though...the power to make decision...it feels kind of good...XD