One thing that consistently bothers me is the seeming ability of the enemy to target me when I think they shouldn't be able to. Like, crawling through a cornfield (uphill!) and having a machine gunner in the town I'm approaching take me out. From my perspective, he should neither have been able to see me or target me...Dunno what's going on there.
Having a powerful rig that allows greater resolution/draw distance is obviously an advantage.
Overall, very good!
Keep in mind, that grass and other small foliage isn't drawn on long distances. So while you were hiding in the crops, you may have laid in the wide open for the machine gunner. I don't know if reducing the details in the graphic options reduce the draw distance of foliage too, if it's the case, having a weaker rig may give you additional advantages by forcing you to use low settings.