I have no problem with the missing rush building. I have a huge, huge problem with the shield waste. One of the exciting suggestions for Civ 3 was to have building more on a empire wide basis, and not a city-state basis. Maybe with the discovery of the corporation, extra shields from the build in one city would automatically go the next city (after X % wastage, X being determined by civ-size and/or gvt. type). In Civ 2, I used to build certain units in certain cities. A city at 17, 25, or 50 shields would build alpine troops, artillery, or M.I. A city at 40 or 80 would build tanks. Etc.
In Civ 3, so many units cost the same, that certain cities are permanently inefficient, because of the # of shields they produce. Oh well, maybe Civ 4 won't suck. (OK, Civ 3 doesn't suck, but it's sort of like a girl that goes in for plastic surgery to make her face gorgeous. But at the same time, the surgeon takes out her fake boobs. 3 steps forward, 2 steps back.)