Just look at all the International Piano Competitions around. And the Guiness World Record set by Octave_Revolutionary. Heck even this forum seems to be a parody of the whole concept of piano as a show-off tool.
I personally think it’s something of a tall order to consider such surveys as “bullshit” - a lot of studies have to deal with information regarding the tastes of people in a society. There’s a lot to be learned about these perceptions. I personally find it highly intriguing, for instance, how Beethoven is constantly preferred over Mozart.
I don’t really care who is the best of them, that is not the point. I only am ever interested in the perceptions of people. The general consensus seems to be that Bach is preferred the most of the three (when considering their total output besides piano) with Mozart as the least - I remember a thread from Talk Classical that showed these results.