If the man you are speaking of does not contaminate the whole Lutheran movement and prove it bad, what about your own approach to those who believe in spiritual gifts. You talked about a Pentecostal church that started praying to Michael. That's really weird and something Pentecostals would pretty much universally disagree with outside of that church. If it's not fair for someone's impression of Lutheranism to be formed by this fellow, why would it be fair to use the same approach to judge all believers or churches who believe in spiritual gifts?
No doubt the man was wrong and their are those in all churches but once again the issue is did the gifts cease and if not are what we are seeing is from God or is the source something else? And again we are told to test the spirits. How do you know these are God? How do you test them? Is it based on something subjective? Is it based on something objective? Is it because looks and sounds good? Is it because it feels good? Is it because it measured against the written word? There is a difference between judging an experience,a feeling,or something that we see and judging a person.