W3schools is a cancer. They have old, outdated information. Their website, their content, and their business model is all a throwback to last decade. They sit atop of the search results, doing nothing, and raking in cash while providing a poor service. Meanwhile, their very dominance sucks all the oxygen (page views, ad dollars) away, ensuring that better competitors can't grow.

What redeeming feature do they have? If you aren't easy to use, accurate, comprehensive, or responsive...how good a reference site are you?

I've yet to see anyone bash W3schools for no reason, but I see plenty of people defending them for no reason.