DeMatteis has written some great stories for DC, though in the VS space, this is unfortunately overlooked and only the feats are noticed.
DeMatteis is quite consistent in writing the same depiction of a Tier-0 God across multiple DC comic series and even across different publishers such as the Divine Creator for Marvel or in creator owned publications such as Seekers into Mystery. However, while his Tier-0 depictions of God are consistent, unfortunately his writing of 1-A and High-1A realms is less so. This is because while he writes realms at these levels, he also writes characters from lower levels of reality, particularly from the material world, easily interacting with these higher levels of the metaphysical world which breaks the rules of qualitative and meta-qualitative transcendence. While this isn’t always the case, it happens quite frequently in his work. Yes he has written many high level characters and has described high tier metaphysical structures, he has also shown on many an occasion low tier characters traveling to, through, and beyond these realms so it is important to separate the real high tier DeMatteis feats from those that violate the rules of qualitative and meta qualitative transcendence.