This is the most backward and unevolved of all the Left Bank (Medoc) first-growths. In 10-20 years, the 2009 Mouton Rothschild should rank alongside the greatest vintages of the last three decades (1986 and the index of tannins, the highest ever measured, a whopping 20% higher than the next highest vintage. The tannins, while present, are silky and well-integrated, one of the hallmarks of the 2009 vintage. An inky/purple color is accompanied by classic aromas of creme de cassis, violets, and hints of graphite and background oak. The overwhelming impression is one of layer upon layer of fruit, full-bodied opulence, and good structure. It tastes as if it were 2-3 months old rather than a post-malolactic, fully assembled barrel sample ... it's that and 1982). Yields were a small 30 hectoliters per hectare, the final blend is 88% Cabernet Sauvignon and 12% Merlot, and the finished alcohol is 13.2% (not particularly high in this vintage). The pH is 3.81, young, but so incredibly promising. A 50- to 100-year wine? Probably.
The second wine, the 2009 Le Petit Mouton, is the finest second wine they have ever made. Aromas of black currants, flowers, mocha, and earth jump from the glass of this fleshy, heady, full-bodied wine. The final blend is 60% Cabernet Sauvignon, 22% Merlot, and the rest Cabernet Franc, and the alcohol level is slightly higher than the Mouton's. It should drink well for 15+ years.
(Robert Parker - Wine Advocate - April 2010)