Very, very, bad.
Pretty much everything everyone's always thought about Barry and steroids, even deep in the recesses of Giants' fans denying hearts, is confirmed in the book. Ass injections? Check. Started over jealousy of Mark McGwire? Check. A see/hear no evil approach by Giants' ownership? Check. A huge cocktail of this and that illegal drugs? Check, check, and more check. There's also a lot more stories about Bonds being a jerk, more details about his relationship with his mistress Kimberly Bell (breast augmentation and "sexual dysfunction") and, well, we'll just let you read the rest.
Suffice it to say, expect the next few days (months? years?) to be pretty rough for Giants fans. And that's an understatement.