I will use them if I am playing against the americans and I want to use a Stug E. Then I sometimes follow up with Stug G spam if it is an open map. The Stug E can deal with the riflemen well enough that I can keep my grens around in forward positions to faust the first allied tank, then rush it with my Stug E and G (maybe 2 G's if I held the fuel well). Works pretty well if you can deal with the first Sherman, after that the Stug spam becomes to strong to do anything about. Jackson's paper armor can just be chased down and the hopefully vetted Stug E and grens can deal with any infantry. It is a pretty fun strategy, I would recommend trying it. Most people will try to prepare for the Tiger in the doctrine and focus too much on AT, so the cheap tanks and strong AI lets you walk over them with the infantry to isolate their tanks.
Edit: This is not a good poll, needs an option for other or something.