I used an ISU-152 the other day and it won the game for us. I just parked it up on a hill and let it cover the top and middle VP, with an AT Gun and Maxim on top and 2 SU-76 + SU-85 on mid. Before they had a chance but after the ISU arrived, how could you deal with that without an Elephant?
However in 2v2 and above if there's an elephant there's no way to deal with it
here's a video where I build the tier 1 tent, press W to buy a scout car and witness the base building get cancelled, yet all the resources are gone. If you watch carefully you can see the building actually gets completed and the unit icons appear in the bottom right grid. Apparently something is lagging behind and the game registers a cancel command.
I assume it's the same thing when you cancel grenades at the last second and don't get the munitions back.
Someone told me in another thread that upgunned scout cars will shoot down their planes really easily. I haven't tried it and it sounds a bit too good to be true but we'll see.
They do sometimes shoot down the plane before it gets to drop the fuel packs
Not every time but it seems quite common