I wouldnt want to miss PhysX anymore. It was awesome in Batman or Mirrors Edge for example. Nowadays, with the ports having almost the same graphics as the console original, its at least something that still gives me the feeling that I am playing a real PC game, and not some half-assed console port.
Now DX10.1, that was useless, and I fear DX11 will be too when I look the extremely short list of DX10 games after 3 years.
AMDs hardware is awesome, but their drivers are STILL just horrible. 2 Years ago I sold my 4850 because it still had the same graphic glitches that my old Radeon 8500 did and STILL the flashing graphics issue. Thats just sad.
I am glad that Nvidia has such an awesome driver support.
I have given up on waiting for BIS to come back to their senses and do a real ArmA 2 successor.