And a little about the vintages you are likely to encounter in the marketplace today.
2013 was a tough vintage with plenty of rain and cooler temperatures so expect restrained wines. Not always an advantage when restraint is so inherent in the wines to begin with. 
2012 is turning out to be a classic if light Beaujolais vintage with supple wines that highlight the freshness and elegance Gamay is capable of. Not at the level of the preceding three vintages with a tough growing season, the lower yields allowed producers to bottle friendly, ripe wines in the face of difficult weather. 
2011 is probably the best all around vintage of the past decade or so. Big, ripely fruited wines at modest alcohol levels provide the best of both worlds. Really a fine vintage about elegance and balance that is wonderful to explore today but will reward additional cellaring.
2010 produced rather fruity and round wines, delicious and of high quality but without the structure and potential for complexity of either 2009 or 2011. Still, there is something to be said for these wines today because they remain quite well fruited, supple and delicious.  
2009 is a grand vintage and if it wasn’t for the quality of the 2011 it would clearly be the leading candidate for vintage of the last decade. Very similar to 2011 though a bit riper and more alcoholic, not that that is often a problem with Beaujolais which typically hovers around 13%. These are wines that are finely structured as well, though I give the nod to the 2011s for their slightly more elegant and racier character.