Since getting the PzIII/IV crew to three skills (and then focusing on the T-44 and M103), I haven't used the Pz S35 very much. It's gone from an all-time high win rate of 70% (at over 100 games) to about 62% now, since I had a string of Tier 5 MMs and...
...while doing this sort of thing is possible, many Tier 3 games have so many yokels in them that even killing over half the team yourself will still end in a loss. I have to give credit to that M3 Stuart for tagging along with me after I saved them from the Cruiser.
The irony is that since I've started using binoculars on the S35 I've only gotten city maps with it.