is it just that they are so much fun to drink? My experience is that Clarets, Burgundies and Rhônes age more slowly and gracefully in large formats, and perhaps even remain "a point" in a longer window, but does the wine taste better than a perfect bottle or even a half?
On the other hand there is something wonderful about filling a round of flutes from a double mag and having the level still hidden by the foil ( Could this one be the magic inexhaustable bottle of fizz?). What about that wonderful Pomerol which lasts more than six glasses.
I have never compared the same wine and vintage from various size bottles side by side. Would the differences only be normal bottle variation? Anyone out there to share your experiences? Salut R