100% agree. I learned so much off W3Schools. Yeah, it's sometimes inaccurate. But the information is a million times better than reading some WC3 specs or Mozilla's developer guides.
Often I see people link to MSDN or Mozilla's developer network when asked for how to learn web development, and all I think to myself as I see that is that if it were me, I would just quit. The content is explained in a way that's just not user friendly for someone who wants to learn for the first time.