I'd rate Walton's autobiography (the old one) as third overall for hoops, behind Russell's (which is the best, natch) and Kareem's.
If you are a Celtics fan and have not read Kareem's, I would recommend it. He never really got a fair shake from the media IMO.
Incidentally I saw Walton two years ago at ARCO Arena, doing guest color for a Kings/Celtics game. What a nice guy, he made a lot of time for the fans and seemed genuinely happy to be interacting with them. That's probably not a big surprise, but in this day and age it is unfortunately more the exception than the rule.