François –
To return to your question (oh, no! let’s keep drifting!)… Whether or not the quality/price correlation is good depends a lot on your palate, I think.
To me, there is a somewhat better correlation between price and quality in Bordeaux and Burgundy than many other regions, though there were certainly many old, established producers in both areas that rode on their reputation for too many years. And the Right Bank garagistes charge a fortune for wines I don’t particularly like. But, overall, prices tend to (you can see I’m hedging) reflect a long-term assessment by the trade and experienced consumers.
In the New World, and in newly developed areas of Europe, price is a less good indicator for me, but that is a reflection of my palate: The most expensive wines from places like the Central Coast of California, Australia and Priorat tend to be made in a huge, ripe style that I don’t like. I therefore often find that there is an inverse correlation and that the I far prefer the moderately priced wines.
Personally, I find the same thing is often true with Barolo. I prefer the traditional producers, who are often cheaper (yes, yes, Giacosa is an exception). Barriques are expensive, after all.
(The size and weight of the bottle is highly correlated with this style, too. I won’t buy, say, a Languedoc if the bottle weighs more than the wine inside. I know it will be a super ripe, extracted, oaky wine that won’t be recognizable.)
However, if you like that bigger style of wine, I think you will find the price/correlation is better in all these areas.