A game which receives 20 million sales would only account for around 20 million people out of the U.S. average population of 313 million, which is around 15%. By this standard, this means that ~85% of the U.S. doesn't give a rat's ass about the game. Thus, by definition, my opinion that [Insert Game Here] is sh*t is more-or-less in the majority's opinion.

This of course doesn't mean that everyone who bought it actually liked it.