I've sat through my share of my own kids' soccer blowouts, and I don't think their self esteem was permanently harmed by it. In fact we look at those times as great learning opportunities.
I'm of the opinion that The Incredibles is the best animated movie ever for many reasons, not the least of which is the way it tells the truth about the whole self-esteem movement.
One of my favorite lines from the movie is spoken by Dash in a conversation with his mom:
Helen: Everyone's special, Dash.
Dash: [muttering] Which is another way of saying no one is.