10 Worst Things The Green Lanterns Have Ever Done
2. The Oan-Magic War - Various
The event DC are most likely to hide from the annals of history whenever trying to make the Green Lanterns looks like heroes has to be that of the Oan-Magic War, which saw the unfortunate Lantern Corps tasked with trying to destroy (or at least hugely limit) the influence that magic had on the universe.
Hilariously, this happens pretty much immediately after the Oan-Manhunter War, wherein the Guardians had the Manhunters - who they had made as their servants - also be wiped out entirely - proving that the Green Lanterns were for a period of time less heroic space police, and more the glorified bounty hunters the Guardians has managed to recruit into their personal army.
Although this works wonderful to explain why magical is a significantly smaller presence in DC comics than it used to, having the Green Lanterns try to wipe out magic doesn't make them look all that great.