Stack Overflow ought to be Google's dream site since it deals directly with questions and answers in reasonably natural language.
But I find the moderation a little heavy handed and an unhealthy amount of people using the platform to be a 'smart ar5e' while offering solutions based on their idea of best practice and not directly answering the question.
Classic case is anything to do with a strict vanilla JavaScript requirement being solved by something like jQuery.
Or a PHP requirement being solved by yet another layer of abstraction.