Google's DMARC report's seem just fine. Microsoft's DMARC reports routinely report broken delivery, BUT the breakage is on their end. They forward to a custom domain, then their DMARC report says, look your email is broken. It is SO frustrating.

That being said, when I had some IPv4/IPv6 trouble on the email server, I did get good reports that helped my discover, diagnose, and fix the problem. So I like DMARC reports. Microsoft's support of custom domains appear to be lacking to say the least.