I don't really know anything when it comes to cosmic-level things in either Marvel or DC. I think that in series's with a shared universe it'd all either end up either full of contradictions or a confusing mess. I'm sure it could be done right, but I've never been interested in stories of characters with god-like powers aside from when writers decide Superman should be unbeatably powerful.

How would you make a world with gods and cosmic entities without it being a complete clusterfuck?