It seems to be traveller folklore that the least desirable seats on airplanes are the middle seats (in other words, with three seats directly next to each other, stuck between someone at the window and someone with aisle access). On some widebody planes (e.g. 777s with a 2-5-2 seat layout), there are even 'super-middle' seats stuck between other middle seats (yes, I made up the phrase 'super-middle' - not sure if there's a better name!)
To me, and I think most travellers, middle seats are the worst of all options: no view from the window, and stuck between other potential strangers to make it harder to get out.
So are there any advantages at all to a middle seat? Does anyone ever pick one deliberately, and why?