If you want tasting notes and rankings, pick up Robert Parker or Hugh Johnson. This is a book about a life in wine, not a book about wine.
"Tasting Pleasure" is a ramble through Jancis Robinson's ascent into the heavens of the wine world. She's been very lucky, and has supported that luck with intelligence and hard work. In other hands, this story might have been insufferable; but Robinson's greatest gift may be her ability to keep a sense of perspective while progressing from one table laden with fine bottles to the next. She is well aware of the essential frivolity of what she does for a living, and also well aware of her good fortune.
N.B.: Unless you're totally fascinated with Jancis Robinson, there are sections that are easily skippable. The book remains, even so, a worthwhile addition to your wine library.