I looked forward to this and bought it, but have since lost interest and here is why:
The game has stupidly high demands of your PC for even the very lowest, and most mediocre graphics settings. My PC happily runs COD 4 and Company Of heroes on high-very high, but it struggled on 'very low' with Arm-A. I have no idea what machines reviewers played it on, but I'm guessing minimum quad core PCs with cutting edge SLI and 4 gigs of RAM.
My machines is a core 1 duo 2 gigs 8800 GTS, and it ran so badly as to be unplayable, and that's even on very low res with everything at bottom.
I'm sure there is a great game in here struggling to get out, but unless your PC is ninja-spec be very wary of buying this without trying a demo.