Man, this is hard to believe. I have had 2 duds so far, the rest have been great. I would expect this with CC's, but not with Tats. Hopefully the rest will be good for you.
I've also experienced a dud once in a while. It reminds me of the sick period I normally experience with some CC's. My brother's box of Tat Especiales started off decent, after about two months, he had a flat one, and now (almost a year later), he said they're amazing.