I'm reading the classic Justice League/Justice League International/Justice League Americs run by Giffen and DeMatteis and while in a vaccum it's amusing, when put into context with the larger DC Universe there are a slew of problems.
One of the biggest ones is why such a loose cannon as Guy Gardner ever be allowed to be a member of the Justice League, causing needless property damage during his fight with Lobo and almost starting an international incident between the United States and the Soviet Union just to name a few examples.
In the DC canon, Guy Gardner is mentally unhinged. His original, comparatively mild mannered personality was changed to be more sociopathic due to brain damage caused by time in the Phantom Zone.