Are you sure the poor performance on AMD GPUs was never fixed? I understand performance was poor on AMD cards when the game was released, which is (or at least was) not so uncommon for AMD hardware, but I thought it was resolved fairly quickly.
PhysX likely isn't going to add a whole lot to the experience so I wouldn't count its inclusion as a reason not to buy the game if you have AMD hardware.
PhysX likely isn't going to add a whole lot to the experience so I wouldn't count its inclusion as a reason not to buy the game if you have AMD hardware.