I managed to retreat almost all of my core force (abandoning a KV-1 and a BA-27, and losing a Komsomolets). I also extracted a substantial fraction of the AUX forces as well.
My final result (Soviet/German):
Men: 422/171
Artillery: 5/0
Soft vehicles: 4/0
APCs: 1/0
AFVs: 7/0
Score: 81/3936 (Crushing Defeat)
I thought that I was doing exactly what I was supposed to do, according to the mission briefing.
Added in editing:
By way of possible clarification, the exit VO and the retreat hex are slightly separated. Getting my units onto the VO did not appear to accomplish anything; the only way I could get them to exit the map was via the retreat hex.