In Stalin's Fourth I spent about half of the scenario in GVs guarding some "strategic" bridges. What that meant in practice was that we sat there in the bushes, shot the bridges down, waited until they reupped and shot them down again. About quarter of the scenario was spent in static AA-guns in the bases. Then we got a flight or two in a plane.
Result? Worst scenario experience ever.
The bridges were a bit of a design flaw as I don't think that had been tried before, and a lesson has been learned there. "Tisk tisk" to whoever gave you that order and didn't "rotate the watch," too.