Thanks to Merijn Knibbe, I have the article "DSGE macro models criticism, a round up. Part 5, the intertemporal government budget constraint" posted on the Real-World Economics Review Blog. It gives an overview about my complaints about the mathematical framework for fiscal policy within DSGE macro models. (A round up of my articles here.)
I have not written about "mathiness" (Tom Hickey compiled a list of articles here), but mangling the constraints on fiscal policy seems to qualify.