This is a discussion on What's the worst cigar you've had? within the General Cigar Discussion forums, part of the The Cigar Lounges at Puff category; +1 on the Fighting Cock. They are friggin awful. I got a couple in some sampler. Other sticks in the ...
Worst cigar I have ever had was a house brand from Thompson cigar called "Encore." It was a churchill. Unfortunately, I got five of them with a humidor as my first purchase. It tasted awful and I was a new smoker at the time.
The worst non-house brand cigar I've ever had was probably a Ghurka but I couldn't tell you which of the 500 product lines it was. It had reserve in the name somewhere but tasted like someone rolled up the contents of an ashtray inside an old wrapper leaf.
I made the mistake of picking up Thompson Black label coronas, the early part of the bundle had a distinct ammonia flavor, after about 6 months they evolved to unexciting. Even for that little coin I wouldn't smoke them again.
The Don Lugos that came with a humidor from Thompson are hands down the worst I've ever tasted. I bought them to put on the bar at my wedding, I actually felt bad putting them out, but at the end of the night the humidor was empty and I heard no complaints.