None.
There is no construction issue that bothers me. Wrapper starts to unravel I toss it, 99% of the time it was my fault because of a bad cut.
Bad burn... I touch it up and dont even think twice about it. Ive never had a burn that ruined my smoking experience.
Wrapper Split... I toss it and grab another one. If it was my last one, oh well, I am pretty sure that the previous 20-24 of them were good.
Tight Draw.... If the cigar you are smoking is "tight" let me ask you this... Hows the flavor? After all, dont we smoke a cigar for its flavor? Dont we base our buying on reviews of the flavor of a cigar? I once smoked a Johhny O that the draw was so tight it was like sucking a frozen milk shake through a coffee stirrer, there was little smoke, but the flavor.... I to this day I rank that cigar in the top 5 of the most flavorful cigars I have ever smoked in my life. I enjoyed every second of that cigar after I decided to not care about the plume of smoke that we all enjoy to blow out that was not there, and just taste the flavors. Ever since that moment, I have never cared about the smoke out put, all I care about is flavor.
Cant keep it lit. Again, most times thats my fault. Im talking, doing something, just not paying attention to the cigar. I relight and go on my way. If the cigar tastes like crap after relight, yup, I toss it, was my fault for letting it go out.
When I read reviews, the one part of the review I always ignore is the construction, same as when I read the review of a restaurant... I really dont care that the food was not plated "properly". How did it taste? I am paying for food that tastes good, not because of how fancy it was put on the plate.