It is not easy to taste the primeur wines and judge the potential quality and taste. Bordeaux is a wine blended from different grape varieties and at the moment they are kept separately in the barrels. For the primeur tastings the cellar master makes a blend that resembles as much as possible the final blend (although some say that they instead make a blend that is easy to taste, but we don’t really know if that is true). The malolactic is sometimes not finished, or just finished, which doesn’t help and furthermore, the wine at this stage is not always very stable so it can matter when, during the week, you taste one particular wine.
But all these difficulties apart, of course you can get an idea of the quality and the characteristics of the vintage (maybe more difficult when it comes to individual chateaux). Anyway, for 2010, really all you have to do is read about the weather conditions and you know the vintage is successful.
And then you buy your favourite châteaux (if you can award them!)