There has been a lot of talk about this infamous person. I am old school Amiga guy but rather new to the amiga.org. When I search on DoomMaster on amiga.org or google.com I get mixed feelings. There is a guy in here who actually meet the poor guy and felt he was quite allright with a lot of knowledge. Then there are other people who are not so comfortable with the him. I can see he had made business on Atari forums too.
Personally I have my doubts that he can be that bad, but that is just me - I do not know him or have made any deals with him.