The major is too late in the game although I had found the M3 useful until the very end of a match.
The ambulance is too vulnerable and can't carry 1-2 (newly produced or retreated/healed) squads to the VP area. The M3 can drop the troops and then drive to different areas to instantly reinforce and then drive back to HQ to pick up a new squad.
I only occasionally use the M3/flamer as a weapon. Basically, with the M3/dodge my troops no longer have to march to the front line. This is a significant time savings and it helps concentrate forces.
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Back in 2013 in team games I would get 1-2 x panther, 1 x brummbar w/spotting scopes and they would do well. The brummbar could stun AFV/smash infantry and Zis and the panther dealt with the AFV.
It's very usefull on fortification commander. If you got pak 43 placed. It's good idea to build 2 of thoose so when ever you will leave it unguarded the emplacments will save it and will not allow infantry to get close to light it and drop artilerry. Like said - Best used in defense, it's totaly not for offensive tactics
I've always treated them as a 'saving a skirmish' unit. If the units that are fighting are losing but have a chance of winning (and this chance can be provided by 1 FJ) I call it in from a building behind the Opfor.
I do not get obersoldaten with LW due to the FJ's being there with the volks and MG34s.
Airborne assault is good but I need to learn how to use it better in a match.