The game was never intended to be a game that grandad can play on his Pentium MMX.
It was a modern intensive game, to showcase the new technologies such as DirectX10 and the realism that could be achieved with the newer hardware.
The game was perfectly playable on odler systems if you turn the settings down, it just didn;t look as good which is really what you'd expect, right?
I never saw why people complained about not being able to run it on all high, if their computers could handle it it would've looked awful.
Hope you can see where I'm coning from.