All the build up for Diggle and the Green Lantern Corps- and Dig's like 'Naaaaa'. How useless was that?
Honestly, it never made sense in the first place. Diggle now had two small children at home and was about to start a new life with his family in Metropolis. Why would he throw all of that away just to become a space cop? It was fan service that should have never been done.