there's factual information in there, but a lot of it is a bit exaggerated and from a very... shall we say, not-rigorous perspective, even if you largely believe in the thrust of what's being said and the facts aren't really up for dispute.
I agree. Perhaps when the book came out in the 80s, and there was far less access to "information", this book was probably great from a "history isn't always as it seems" perspective. Today we are far more conscious of the "elite narrative" of history. Now I think you'd be better served by perusing the table of contents and finding various sources on the subject matter that interests you.
It's well written, and Zinn is great. Just feels a bit dated.