360 vs lower end PC Thoughts...
For anyone interested:
Played both the PC and 360 demos, and ran back and forth in my house to view the differences on a lower end PC vs 360 at various points in the demo.

My goal was to compare the visual aspects , not necessarily any gameplay mechanics / fps. Also, my interpretation is subject to my hardware/setup, so it certainly may vary for others - and to see if it seemed worth a PC upgrade (knowing how poor the FPS would be)

PC: Monitor (2405FPW DELL), 5.1 speakers, 1gig ram, Athlon 64 3200, GeForce 6800 ...not quite state of the art...
360: 360+ 720p plasma/Panasonic, 5.1 speakers.

In short summary, I found that the 360 is the better overall experience graphically for me. I think a large portion of that has to do with the vibrant colors on the plasma looked way cooler (ie the neon lights were great on plasma, but very dim on PC). I also found that the texture difference on the PC vs 360 was nearly non-existent. I thought a huge difference would be there , making the PC version much more 'crisp', but that wasn't the case. I found the textures looked nearly identical, especially when up close (they both looked equally low res , sadly.)

Even the distant objects (I find the 360 skimps on far away objects) wasn't much of a difference when looking down hallways, hardly enough for me to notice.

Only things the PC had better was better AA, and that wasn't overwhelming, and some of the smoke effects were better looking (but chalk that more up on a monitor vs plasma, than pc vs 360).

Given I tried to set up the graphics options on the PC/monitor , and 360/plasma to be as close as possible - it was my determination that the 360 version, oddly, was more impressive as a complete package given it looked more vibrant, and had better effects for the most part (water, neon/glow, lighting), and had practically the same textures, over spending a big cost to upgrade a low-end PC.

I'd be curious to hear about anyone with a top end rig compare to their 360.