Just what the hell are you talking about?
Clear Sky RUNS JUST FINE for several months now.
They not only fixed everything but xRay v1.5 (current engine under a fully patched Clear Sky) is actually a gorgeous-looking DX11 engine that scales from DX8 hardware to my 4850 X2 2GB and runs at decent framerate.
If you want to see
a really poorly coded (=PoC-level) game look at Crysis.
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