This is a big BUT (and I cannot lie), the word "value" is relative to the cost of living in the Bay Area.
Literally every neighborhood on this "best value" list has a median home value of more than $1,000,000:
Trulia.com summarizes their findings:
The Redwood City neighborhoods that rank high on our list scored high for a multitude of highly-rated restaurants, low crime and a short commute – just 30 minutes on the Caltrain commuter train to downtown SF or an even shorter commute to Silicon Valley. Unfortunately, those amenities will cost homebuyers. The median home values range from $1.1 million to $1.4 million: prices fueled by a tech boom and high paying jobs at Google Inc. and Facebook Inc. nearby. While it is true San Francisco’s median home value is $1.2 million, remember: we measured value, not just affordability.