I feel that I have experienced exactly the opposite to the original post. I have yet to join a group with someone who is multi-boxing and wished they weren't. My experience with mutiboxing accounts has been nothing but positive. I do not have the skills, to hyperzerg through all the quests. In the past week, everytime I have been in group when I suspect someone is multi-boxing, I was weak link. Not only did they run the quest well, but they ran two characters through better and faster than I ran one. Additionally, I was able to benefit as they pulled the gear I was looking for on their second account which they then passed. I feel bad the original poster has had difficult experiences when they have grouped with multi-boxers. I am curious as to which of us is the norm and which is the exception.