User blog comment:DaSuperNaturalist007/The Crazy new ideas!/@comment-24126019-20131223081944/@comment-5619706-20131223153336

This is exactly the problem. Other than 'omnipotence', what else makes him notable? There is no other way you can create a Big Bad that could trump God. Additionally, a Big Bad with omnipotence is unbelievably difficult to defeat. Suspension of belief would have to be stretched all the way to even think that Sam and Dean could defeat a being of that status. How does it fit in the lore? What is the sentient wars? How was it trapped? What other entities were trapped with it? There's a reason why many people think Superman is boring--because he's really powerful as opposed to other superheroes who had several flaws that make them more human and more dynamic in terms of developing a story. With Superman, the only source of conflict being exploited is almost always his weakness to kryptonite, whereas Iron Man, for example, has an inflated ego, alcoholism and arrogance that could be the source of conflict.

In short, creating a being older and more powerful than God is boring/static, one-dimensional and too powerful to be defeated in believable terms.