A while back I found a site that had the comparisons between the low, medium and high settings.
The difference between low and medium was clearly visible, but the diff between medium and high was barely different.
I run all settings on medium with 4aa and have noticed no difference in graphics than when I was playing settings all on high, except for I no longer have lag at the start of the level.
I have a 6800gs and run at 1024x786 70hz refresh and its fine for me and my characters don't look like lego men.
The difference between low and medium was clearly visible, but the diff between medium and high was barely different.
I run all settings on medium with 4aa and have noticed no difference in graphics than when I was playing settings all on high, except for I no longer have lag at the start of the level.
I have a 6800gs and run at 1024x786 70hz refresh and its fine for me and my characters don't look like lego men.