No, DMARC authenticates you as a sender to fight phishing but does not tell you what the rest of the spamfilter concludes. You can still send spam using DMARC. The reporting feedback of DMARC is necessary to find problems in the authentication. An added bonus is that you can identify spammers.
Microsoft has SNDS which is pretty helpful in finding moments when things go bad. It does not identify your customers, I have to find that myself.