What is the old expression about using a bazooka to kill a house fly? I think that is a good way tosummarize this situation.
Some folks in the security community are furious, saying Microsoft went too far and darkened too many legitimate sites that had nothing to do with distributing malware, (check out comment section on Krebs on Security). CSO’s Steve Ragan pointed out, "Four million domains have been shutdown, despite the fact that Microsoft only wants 18,472 of them." Microsoft called that "temporary loss of service" to legitimate sites a "technical error" that has since been corrected.