Well, I played SH2 on a Gateway PIII with a some old ATI card in it. I'd be pretty bummed if 6 years later, on a dual-AMD 64-bit machine with an NVidia 8800 graphics card with 512MB VRAM if the sim didn't look substantially better!
Seriously, would you be happy now if your desktop graphics in XP or Vista looked no better then a Windows 3 desktop in 640x480 display?
I expect that as the hardware improves to allow for more, that the whole package will improve - game play and graphics. What's the point of a nice big wide screen LCD display if it's filled with drab old VGA graphics? What's the point of GPU's that have more computing power and potential then your main cpu did back in 2001 if you are just going to have them idling 99% of the time?
I want it ALL, dangnabit!
P.S. I mean, companies are using NVidia 8800 series cards and NVidia CUDA tools to run Monte-Carlo simulations for research, and MATLAB has a CUDA plug-in to leverage NVIdia GPUs for parallel computations. At the least, I want mine rendering a decent ocean physics model