In short, it is close to garbage.

Longer answer now: the author refers to many events that did occur and sometimes somewhat how they occurred. Overall though, all the details and how things happened are difficult to verify and I would say difficult to support with evidence.

Organisations like banks, the IMF or the WTO certainly screwed over a few places with their policies and ideas. But where the issue is how he presents it and how he puts it in the context of a "global empire". I would as far as to say that he falls in the conspiracy theorist realm.

I would personally advise to get informed on the events he discusses on their own. If you want to know how the IMF and how loans functioned for third world countries or how bribes affected the policies of some nations, I would strongly say make a post here or ask a political scientist working on that.

So how accurate is it? Well, a lot of it is dependent on what he says and is not very substantiated. The things that are substantiated you'd better off reading or learning about them through other means since he will only cloud the bits that are accurate to make them less so.

I really want to be clear though: any 20th century South America historian can give you a lot of stuff regarding how the US and other have gotten involved in stuff that would fall in the realm of conspiracy if we did not have so much documentation on them. So the stuff he mentions might have occurred. Where you have to be careful about are his accounts of it and really, that's supposed to be the "interesting" part of the book so there is not much point to it.