Did that Dolby B noise reduction thing ever really work?

Did that Dolby B noise reduction thing ever really work?
It is commonly thought that the Dolby button on a cassette deck does nothing except make the sound dull. It's supposed to make the sound less noisy. So why doesn't it work properly?
Source: www.record-producer.com

Kanye West: Hip-hop artist of 2005
So much goes into the mix when choosing an artist of the year. Not only should the artist be at the top of his/her musical game, they must be highly visible in a way that impacts the world outside of...
Source: rap.about.com

Three things that are tragically wrong with CDs
Pure perfect sound forever? The original CD slogan wears thin in the face of three major defects in the format
Source: www.record-producer.com

Narrator and orchestra - an impossible PA task?
The narrator needs a microphone, but the orchestra doesn't. Is there a problem here that is impossible to solve?
Source: www.record-producer.com