If I had to guess, I think the "dud" part of this smoke had to be the wrapper. The bitterness was strong mostly on my lips and not so much from the smoke, if that makes sense--I even picked it up on the prelight draw. Never encountered anything like this before, so I just thought that it would resolve at one point or another. It didn't.
It's not really fair to give a cigar like this such a poor review after only one stick that happened to be a dud. After years of smoking and hundreds of sticks, it was just such a new experience that I thought I'd share