One of the claims made for AoP is that it is the first add-on to feature believable and realistic outdoors scenes. Well, I'm afraid that isn't true. The exterior scenes presented in AoP fall way short of those in, for example, Zerstorer or Scourge of Armagon. However, this isn't a problem as the plotting of the levels for single player is excellent. Traps abound for the unwary who prefer to charge about with mad abandon, including the rather nasty Pin Head trap.
Survival is a matter of cunning as well as being quick on the buttons and mouse.
The levels reek atmosphere, with even the initial selection level providing an impressive demonstration of the AoP teams talents. Problems and puzzles are cleverly designed, so that replayability is high. My only complaint is that perhaps AoP is a little short - then again, it's a universal rule that you should always leave your audience wanting more. Of course, it's not enough these days to feature the same old Quake Monsters, although such well-known and hated standards as the Ogre, the Scrag and the Grunts and Enforcers do make appearances. Beware also the Lightning Enforcers, who look just like standard Enforcers, except that they are armed with lightning guns.