Does anyone not get the fact that it significantly decreases fps in graw and the fact it puts all the weight on the video card for rendering so you also get fps jumps on explosions.
I think the way you looking at it is all wrong. You should think of PhysX as a setting just like HDR is a setting. Maybe you did not know this but you can use PhysX though software. So you can get the graphics of PhysX without buying the card. The benefit of having the card is playing a game with PhysX through software might give you 20FPS while using PhysX through hardware(getting the card) would give you 40FPS.
If you not interested in the PhysX graphics then dont get the card. If you do want PhysX graphics complaining it lower the FPS is no difference then Complaining HDR lowers the FPS.
The PhysX card is not lowering the FPS. Turning on the setting PhysX is lowering the FPS and the card is supposed to help with that.