On the down side, Strieber adheres waaay too strictly to his often misconstrued notions of what is true. Refuses to consider that the power to say NO to negative entities is within us all. Refuses to see that he surrenders to them by submitting to fear. Refuses to ~look within~ when trying to understand why negative entities are drawn to him (or anyone) in the first place. And is overly conservative in his manner.
On the plus side, Strieber hates the government, is a fine writer, and is dead honest about his experiences - regardless of whether or not he truly understands them.