In the last scenario I played -
http://www.pg-hq.com/library.php?type=sc...id=PzLi003 - the SPW 251 the Germans received as reinforcements were of very little value as the Soviets had already sealed off their access to the main sector. I used the SPW 251 to shut down an AT gun which was keeping the panzers from flanking the town to the west but lost 3 of them on the way.
In
http://www.pg-hq.com/library.php?type=sc...id=WiSo025, I set up two stacks of 3xM3 in the center of town and out of sight of the panzers. My idea was to use them as part of a shock counter-assault troop to deny town hex control/contest to the Germans. That did not work well but I think that was more a factor of rolling 3 consecutive "1" in assault than a bad strategy.
If there is no much armor in a scenario or I think taking a shot at the APC is a very low priority, I sometimes use a APC or two with a weak leader (7-0-0 or 8-0-0) to harass demoralized troops. My primary goal is not to finish off the demoralized troops but rather to push them further away from the action.
Sometimes I use them to move a leader and a foot unit past enemy foot units if I need an OBA spotter in a particular spot. It's risky but then again, I am not risk-averse.
Sometimes I leave them behind as I fail to devise a good use for them.
The good thing about fighting battles on cardboard is I can try any crazy strategy which enters my mind with no real consequence except a bruised ego.