Dunning-Kruger Effect

I came across a technical blog yesterday that talked about Dunning-Kruger Effect.

Simply stated, "People with less competence will rate their ability more highly than people with relatively more competence."

source: http://en.wikipedia.org/wiki/Dunning-Kruger_effect

You can read more about it here.

I reason I bring up the topic is because I have seen many people bash Warren Buffett; however, none of those people can demonstrate a better performance.