Things that really break my suspension of disbelief:
Extraplanar travel is expensive, dangerous, and ultimate superfluous, and yet most nations attempt it on a regular basis?
There's only one race, but one hundred lanuages. How does that even work?
Ranged combat is broken beyond belief.
Residuum sits in massive pools deep underground and is controlled by a cabal of small, poorly defended countries who, for some reason, don't control the world.
Clerics aren't granted power fom their gods, and it's heavily implied that the god's don't exist anyway. Anyone care to explain why they have so much political power?
Science is broken beyond belief.