They don't just go and blow up Earth lol.
I did say in character. If you think the only thing they could do is piss him off for 24hrs then yeah. Unfortunately I don't have a scanner, so if i find scans then I will be sure to post them. When did Savage Hulk have a speed advantage over a lantern? and can he really dodge the omega beams or any other ranged attack that they could blast him with?
He doesn't just spam the beams. And shouldn't Hal be able to stop them with a construct?
To say Mongul is an inexperienced fighter is like saying Superman is incapable of moving planets. Granted writers really screwed Mongul over Post Crisis but seriously. And when it comes to the rings Mongul is actually very gifted with them because he didn't just go rushing into battles without any knowledge on how they work. He took his time to learn everything he need to know.
But the rings all come down to will power. If one has more will power than the other they'll win.