Noticed recently that people are producing real models of crates, boxes, houses etc.
As the world itself is made up of mostly boxes would it not be a better idea to simply produce these items as boxes i.e. 6 polygons.
Use of transparency allows everything from fences to damaged walls to even shops or empty houses to be produced as a box.
Granted war ruins you intend to walk through need a bit more than 6 polygons but detailed models for general scenery even using LOD seems a waste of polygons and engine speed!
Better to create a massive environment with detailed fighting spaces within it and conserve the saved speed for characters, ai and particle effects.
Surely a well paced game would prevent you from investigating the quality of the environment anyway?
Here's a few screenshots of my own 'fall out city' WIP game where the houses and shops and even the fences, in fact everything is boxes.
mpc