Debt, in particular, contains a lot of howlers and conspiracy theories (especially relating to the dollar as a reserve currency and descriptions of monetary systems) that really don't belong there and (in my opinion) don't strengthen the work. It's really mixed bag where there is some rich anthropological work and ambitious subject matter combined with highly politicized and tendentious claims. Definately read him, but just be aware that his concern for accuracy is about the same as Zinn's "A People's History", which has a similar density of howlers due to the political agenda getting in the way of the work. Both of these works would be vastly improved with some rigorous fact checkers cutting material out, and they would still have evidence left to support their thesis.