I wouldn't if it were not for Microsoft's never ending blog propaganda postings that it does indeed offer such security performance. The danger in that garbage is that there are a lot of naive consumers and system admins to boot that take those statements verbatim. The truth of the matter is Windows Defender is security-wise "architecturally" flawed since it employs a "band-aid" collection of existing and accessible Windows mechanisms. As such, it will always be susceptible to exploitation and by-passing. It really doesn't matter what "latest and greatest" security mitigation WD is currently introducing if the product or related protection mechanisms themselves can be easily circumvented.