The reformation was about getting back to the original foundation thus the focus on sola scriptura. But I think there is a lot of anachronism that goes on by sacramentalists who read into the past; Just as for example Catholics would say that pre-reformation Waldensians denied the doctrine of the communion if they thought it was symbolic, or that they denied the doctrine of marriage if they believed marriages could be performed outside of the roman catholic church, or that they didn't believe in baptism if they preferred believers baptism over infant baptism.
The problem with Lutherans is that Luther didn't think people should associate themselves with his name or call themselves Lutherans. You probably know the quote right?.. about him preferring they name themselves after a sack of maggots or something? ;)
But seriously, I kind of doubt Luther would join the Lutheran church if he was alive today.