I like AB... when I was working at the shop I smoked through a few boxes of the American classic... really good connecticut smoke for cheap...
also smoked a few boxes of the tempus, tempus maduro, prensado, and sanctum...
I liked all of them and experienced very few constructions issues... the issues I did come across usually related to the draw...
AB played the "beat the fda" game a few months back and I got to try pretty much every new blend they have... most were misses... most were inconsistent in terms of quality and construction... these were probably the only ones worth mentioning:
Pedro Pan - first batch I got were really good... every batch after that was all airballs... hope they figure this one out cuz the first ones I had were very enjoyable...
Magic Toast - Smoked several of these in the corona size and they only got better with age...
Raices Cubanas - while not technically AB, it's rolled at their factory... probably the best cigars they have going right now... solid construction, rich flavors... the original and the simbolo were both good...
There was a really good interview in CA about a year ago... it touced on all the construction and draw issues they had for many years, explained why it happened and what they did to fix it... definitely worth the read...