Their curve isn't actually unforgiving in PS and BS, I looked into it when I took the tests. The questions are just trickier and the curve is basically "AAMC standard" with a few ridiculous parts of the curve in VR. I.e. 10/11/12/13 in VR are all raw pt from each other, and the low end of the VR is harsh.
I think I averaged a 31 on the ones I took, but I don't know what to think. The BS questions usually have very poor question stems and answer choices, the PS really, really, really tries to trick you, and the VR is just too easy. Overall, I don't think I've ever seen anyone do worse on AAMC's than GS. Usually people do a good deal better on AAMC, but the VR is just too easy, and it really throws things off, IMHO.