I agree that the tone is off-putting and immature, but attacking the author and the site doesn't change the fact that it gained traction and many students seemed to enjoy it (if we can believe the claims). There's clearly a demand for this type of site, so any technical or novelty merits are irrelevant.

What the author did wrong was mishandling the negative response. If he had been open to the feedback and worked on a plan to address the concerns, the site might have stayed up. Hopefully this is a learning opportunity, as he clearly needs it.