I think I must live in a different country to the rest of you. I've never noticed anything being too bright other than folk who don't dip their lights, people with aftermarket HIDs in reflectors, and people with lights adjusted too high.
When I was driving my S2000 I did notice if a 4x4 was behind me because of how low I was on the road but a quick flip of the mirror and all is good.
I really don't get it.
I'm with you. It's very rare that I get a car approaching which I feel is too bright, unless as you say, they aren't using dipped, or have a dodgy aftermarket 9000k HID kit.
I do tend to get flashed more often in the S3 than I did in my A4 though.