You're right. Everywhere I've gone to school or worked, any big online forum was mostly complaints, even though I went to great schools and had cushy jobs. You'd think every course curves to a D- and every employee gets a 10% yearly pay cut. It's simply because one unhappy person can be as active online as 100 happy people.

And on some sites like Yelp where complainers aren't disproportionately active, complaints can have disproportionate power. Like a 4.5-star restaurant's average is affected way more by a 1-star review than a 5-star review.