Yes, this is a constant debate. One thing that isn't often discussed, though, is when the sun is beaming into other passenger's faces, but yet doesn't affect the person on the window. A few times recently, I was getting killed by the glare from the other side of the aisle and there was virtually nothing that could be done about it. Typically, if the shade is lowered to half-way, the glare is eliminated but the person can still see what they want to see or they can still get some natural light.