What sort of spec are you running pc wise Pete? I ordered a copy recently as it looked pretty cool, but the requirements are pretty much what my pc is. Past experience tells me you usually have no chance running a decent graphics setting when your pc merely matches the requirements.
<<< System Summary >>>
> Mainboard : PACKARD BELL BV MCP61
> Chipset : nVidia 6100V
> Processor : AMD Athlon 64 X2 4000+ @ 2100 MHz
> Physical Memory : 2048 MB (4 x 512 DDR2-SDRAM )
> Video Card : Nvidia Corp GeForce 6800 GS [NV41.0]
> Hard Disk : ST316021 (160 GB)
> Hard Disk : Generic USB MS Reader USB Device
> Hard Disk : Generic USB SM Reader USB Device
> DVD-Rom Drive : Optiarc DVD RW AD-5170A ATA Device
> DVD-Rom Drive : VT2262T TRF002S SCSI CdRom Device
> Monitor Type : Philips Philips 170S - 17 inches
> Network Card : Marvell Semiconductor (Was: Galileo Technology Ltd) Yukon 88E8039 PCI-E Fast Ethernet Controller
> Operating System : Windows Vista (TM) Home Premium Home Edition 6.00.6000
> DirectX : Version 10.00
> Windows Performance Index : 3.0
and it runs it fine on normal gfx (i havent tried to put it higher, as it looks fine as it is), with the aero interface running
Try running the test on here, it should tell you if youll be reet
http://www.systemrequirementslab.com/referrer/srtest