They are supposed to be the single most technologically advanced species ever. And their stuff looks like magic of the gods when it's billions of years old technology that lets them play with the universe.
Only, it never looks like that when you see it. Kryptonian and Oan stuff almost always looks like it's way more advanced and capable of a lot more. Coluan should by all rights be more advanced too since they are the smartest smart guys ever but always fall short. and even Earth is capable of making people more powerful on an individual basis with what's around from all the evil scientists and villainous organizations.
Captain Atom, Brother Eye, Amazo, Monarch, Captain Comet, all seem ridiculously fucking powerful compared to all New Gods short of Highfather and Darkseid.