For those unfamiliar (I'll explain soon why you might be) Temecula is a mid-sized town in Southern California's Inland Empire located part way between Los Angeles and San Diego. The town of just over 100,000 people, has been incorporated for just 20 years and had large population booms due to rapid real estate development when prices were going crazy in nearby L.A. and Orange County. During this time a rather successful wine scene emerged, and with nearly 15 million potential tourists within an hour and half drive, Temecula's wineries have seen success and growth. While the area saw a population decrease and large numbers of house foreclosures during the real estate bubble burst of the last couple of years, the wineries are still packed on any given weekend.

As an Angeleno who can not make it to Paso Robles, Sonoma, or Napa very often, I have on several occassions made a trek out to Temecula to enjoy the scenery, and the scene. Most recently I spent a great day celebrating a good friend's 30th birthday on what could technically be called a 'booze cruise' (albeit a rather calm and respectful group of booze cruisers.) We visited several wineries in the region and had a fantastic time. It clearly was the type of event that keeps Temecula busy and successful. But I do have a few critical observations about what is happening in Temecula, and why you may not hear much about them outside of So Cal.
Like most wine regions, the wines we tasted offered a wide range of quality and pleasure. While several were nice, several were absolutely terrible. And I mean terrible. While not the majority there were certainly more than one wine that tasted like no more than water with a spritz of lemon. And maybe some soap. Primarily it was the white wines that fell completely flat with a lack of any developed flavors, and a blaring lack of integrated acidity. On the red side many of the wines had nice aromas of expensive oak, but across the palette lacked any sense of fruit and had out of whack acidity that seemed like it had been added a bit carelessly. This sense again was not in the majority of red wines, but present in several and across several wineries. Temecula is hot and I imagine can be a difficult place to grow grapes that cool significantly enough at night to maintain acidity, therefore requiring the addition of tartaric acid during vinification. But it didn't always seem to be done with great success.
The wineries in Temecula seem to eschew traditional wine media (ergo 'scores') and instead display walls and showcases full of ribbons and medals from wine competitions, with literature and signage indicating that what you are about to taste is 'award winning.' There is no need to debate here the validity of the various wine competitions and fairs in which these awards were won. I will make the observation that in order for Temecula to remain outside the rest of the wine world, and therefore avoid the competition and comparison that would follow, it seems they have chosen as a collective to stay outside of more traditional methods of marketing and exposure.
What this essentially allows Temecula to do is offer their wines at absolutely ridiculous prices. Again, this is a generalization and not true across the board, but I saw a 2004 petit verdot selling for $105 that had absolutely no fruit expression left, and a single vineyard syrah that was drowning in oak for $95. What? This stuff must sell to people who do not realize, or possibly care, that you can buy some of the world's finest syrahs and shiraz for less than this, or close to it. I couldn't help but think of all of the outstanding Washington semillon, New Zealand sauvignon blanc, Argentinian malbec, and Cotes du Rhone I could get for $15 and just cringed at the outrageous disparity.
So how do I personally feel about Temecula as a whole? Actually you may be surprised to find that despite my critical observations I think they have a very good thing going for themselves. And their guests. I honestly had a great time, thought that the people were incredibly friendly and fun, and would recommend it as a Southern California tourist destination without reservation. Now, I will be holding tight to my dollars as I do not feel that much warranted a purchase, and do not feel guilty about that when paying $15-$20 for a tasting. But I would go again, at the drop of a hat.
To wrap it up I want to say that these criticisms were not to be made about all the wines in Temecula. There were three in particular that stood out to me as good wines that were worth the price they were selling at:
South Coast Sparkling Blanc de Noir - with a touch of remaining residual sugar but nice bubbles and a good crispness made this bottle very tasty and refreshing for a reasonable $18.
Leonesse 2009 Melange de Blanc - a blend of roussanne, marsanne, and viognier offered great mouthfeel, peachy aromas, and a very white rhone-like palette that was tasty and correct at $24.
Leonesse 2007 Signature Syrah - showing some cool syrah traits of smoked meat and subtle spice this syrah was truly delicious and probably the best red wine I tasted in the valley, and one of the least expensive at $34.