I've smoked a ton of bad sticks in my day, but the worst brand of cigars for me would have to be non-Cuban Montecristos. I had one good stick about a year ago. A Montecristo Monte. So, silly me, I bought a Montecristo sampler then a 10-pack of Montes on a couple of cigar auction sites. Every single one of these Montecristos has been awful. Even having rested them for a year. The silver ones, the white ones, the brown ones, the Montes.
They're squishy, they tunnel, they're almost unsmokable really. Couldn't be one batch because I ordered them from different retailers at different times. And they're kept in a humidor next to sticks that smoke just fine, so I don't think it's that.
Dunno.