Developing a taste pallette

[Elephant Glue]

As someone with limited experience with wines, I recently tried to broaden my horizons. I usually drink Merlot, Pinot Noir, and Zinfandel wines from Ravenswood or Blackstone wineries. I bought a Cabernet Franc 2002 from Stepping Stone winery for about three times as much as I usually pay, on the recomendation of a wine-store owner. While I agree with him, that it is a very nice wine, I fail to see why it would be concidered better than the wines I usually drink. Is it just that I haven't developed a sophisticated enough taste pallette to distiguish the difference?