This. A thousand times this. The issues I've had with ISP DNS... ISP A making their very fast service look dog-slow with terrible DNS (and a terrible wireless

This. A thousand times this. The issues I've had with ISP DNS... ISP A making their very fast service look dog-slow with terrible DNS (and a terrible wireless router, to boot). ISP B sending mangled responses to some popular requests including facebook.com (which is what made fixing it a priority in my household) and so on...