For me it depends on the nation. Some need much more information out there, others not so much.
For instance Darguun, Mrorh Holds, Zilargo, Droaam, Aerenal....we could use Five Nations level coverage on each of these. Political factions, settlements, the works.
On the other hand, there are places which I think are best left with less information. Eldeen Reaches, Shadow Marches, Demon Wastes, Q'barra, Frostfell...these I think are best left for the DM to fill out as s/he needs.
The middle areas (Talentia, Valenar) could go either way.
The problem with recent Eberron books (Faiths) is that they seem to try and force each different section into the same exact format, which leads to awkwardness I feel. If they try and do this again then we will end up with a single Other Nations book which has four pages on each nation and little useful information.