Aproblematic growing season led to mixed quality in the 2010 vintage of California Merlot. It was just a year ago, with the excellent 2009s, that California showed what it could do with the grape. But in 2010, Mother Nature nodded to why vintners in Bordeaux use Merlot almost exclusively as a blending variety and not in standalone bottlings. With 2010, Merlot shoppers can find satisfaction, but will have to buy carefully. Wine Spectator's Tim Fish explains.