The setting is minimalist from a traditional CoC standpoint. Almost all the standard Mythos creatures have retreated or become scarce, putting the focus on just a few. However, the remaining groups are well-realized, and well integrated with the major enemy organizations. Majestic-12 is kind of bland but effective (what they get wrong, their history, and their hidden manipulators are more interesting than the actual organization and NPCs), but while I'm bored to tears of occult Nazis I have to admit the Karotechia are appropriately creepy, and the UFO investigators are also good. The chapter on the Fate is, however, the worst in the book; the descriptive prose is just as morbidly effusive and ultimately empty of content and nuanced restraint as the poetry of a 14 year old Goth. On the other hand, making Delta Green a reactionary, paranoid, poorly-staffed and poorly-informed conspiracy is a stroke of genius, and supports the tone of the setting far more than the standard conspiracy nut's wet dream of all-knowing Gnomes from Zurich with unlimited resources.

I really like how the setting's major players have little idea what's actually going on, though some campaign advice on how to gradually reveal the secrets would be very useful; the sample scenarios set a bad example, basically spilling the central secret of the game in just a handful of adventures. Otherwise, the remarkably extensive set of adventures range from poor (an introductory scenario that has to explain why it doesn't work with the standard DG group of adventurers is not off to a good start), to a decent character-driven investigation, to a pretty good climax (even if I'm not a huge fan of the big ball of rust). The rest of the book is stuffed with more campaign tools, which overall are fairly good. I like the extensive list of federal agencies (with sample stat blocks), and the player handouts of key manuscripts, but some parts could use better integration into the rest of the book (like the security classifications). Unfortunately, the editing of the d20 insertions is atrocious enough that I almost bumped the rating down to 7.