Just picked up these issues, and my verdict is in. GoG wins.
He's nearly the plot device character that DD and Thanos can be.
He controls time and cirscumstance to an uber degree. Adjusts on the fly and alters battle conditions in his favor. Hell, he even said that he let the team win, and it still took them 100 years to do so. He was only interested in killing Supes and lost interest in the battle after that point in the book.
It's like the worlds best martial artist in a room full of deadly superintelligent hornets. He may take out some, but is ultimately doomed to fail.