Making sure they don't put anything in a bottle that tastes like Retsina.
I would agree that Retsina is an acquired taste, but I have acquired it.
Sadly, the Retsina we can easily get around here is pretty wimpy. It used to be better, and there used to be more choice. It is surprising, because there is a large Greek contingent in and about our community, and a lot of choice in Greek food, some of which I am led to understand is quite authentic.
All I know is that I like Greek food, and I like Retsina, and the two together are better than the sum of the parts (IMHO).