Some complaints about Empire Earth apply to EDMW. Even though you're constructing B-52 bombers in the World War II Age, your citizens are still living off apple trees and mining rocks. In fact, the game doesn't deal with market economics at all, since each civilization must exist as a standalone economy.
Despite the massive download sizes of both demos, installation is painless and system requirements are reasonable. We did experience one system crash during a deathmatch with the computer in the multiplayer demo as well as a few moderate program hangs, but an auto-save feature allays some of that frustration.