Amazingly, every Plavac Mali and every Debit wine that I've had has tasted unique, and there really aren't many grand, sweeping generalizations to be made in regards to a Croatian wine-making style. That being said, I do find that the wines made with the Plavac Mali grape (relative to zinfandel) tend to be very dry and minerally. I would also say that they are more Old World than New World.
Wine production was controlled by the state when the Balkans were united as Yugoslavia. Tito did not allow individuals to make their own wine. Instead, cooperatives produced all of Croatia's wine. But everything changed with Croatia's independence in 1992.
I've been lucky enough to drink wines that are exceptionally balanced, and I really like the wines made by Milicic, Matusko, and Bibich. All three wineries distribute their wines in the United States. Wine Enthusiast recently provided the following list of distributors distributing Croatian wines to the US: Blue Danube Wine Company, Vinum USA, Oenocentric, Katharine's Garden, Empty Glass Wine Company, Tasty Wine Company and Dalmata.
As a last note, I highly recommend trying the wines made with each of Croatia's grape varieties several times. Usually, if I try a wine that is made with a grape that is new to me, say Petit Verdot, I give it two chances. If I don't like the wines either time, I tend to assume that I don't like the grape. In Croatia, however, winemakers are experimenting with different styles, and the wines simply are not consistent. I drank three wines made with the Debit grape before finding one that I liked. In short, I recommend withholding strong judgment until the country has had more time to weed out the less innovative and sincere wine producers. In my opinion, there are great wines being made using the Debit, Posip, and Plavac Mali grapes.