For instance, has anyone researched critic reviews about the quality of Rioja Tempranillo wines? Or maybe Bordeaux wines? Has anyone noted that wines from x region tend to receive x awards? Things of this nature.
To add to what g-man said, you're jumbling up too many different things.
"Wine Quality" and "wine ratings" are completely different things and only marginally related. Don't use one when you mean the other. Ratings are what an individual likes. SOME
individuals are able to say that a wine is off for some reason or another, and some of those people are critics, but generally when you're talking about ratings you're not talking about "quality".
As far as Rioja goes - over the years, I've had many hundreds of them. Tasting a wonderful wine that's over 50 years old tells you what about quality? That the particular producer was able to put out a fantastic product. The guy next door maybe not. So how do you assess an overall region?
If you want to learn about that particular region, Wine Spectator did a very good article recently.
Regarding whether wines from a particular region get high scores, absolutely. Mediocre Burgundy gets scored highly because it's "supposed" to be good and people who rate it make lots of excuses for bad showings, usually stating that it's too early or too late for the specific wine. What you learn from that is that Burgundy has a drinking window of about five minutes.
Bordeaux is absolutely huge and produces an ocean of mediocre wine, but many of the better-known chateaux get great ratings nonetheless because they're famous.
Many of them, and many producers elsewhere, can produce "quality" wine in that the wine is not bacteria-laden, not incompletely fermented, not unripe or bitter or oxidized, etc. So all those wines will be "quality" wines.
That has nothing to do with whether they taste good.
I think that if you're going to do any kind of scholarly study, you need to learn a lot more about wine. You wouldn't go out and do a report on the reticular activating system without having any idea where it was or what it did or having read a little of Morruzi and Magoun.