Dirty fighting” is a bit of a nebulous concept. In general, it tends to mean using techniques that are less than honourable—tricks, ambushes, poison, and so on. Yet what one person considers honourable isn’t necessarily the same as what another person does, and truth be told, if you’re in a fight to kill, is anything truly honourable or dishonourable?
Dirty Tactics Toolbox talks briefly about the “Ethics of Fighting Dirty”, pointing out that dirty fighting isn’t necessarily evil, and that context and culture can play a large role in determining what is considered dirty fighting. The book as a whole doesn’t make any judgements on whether any particular methods of dirty fighting are good or evil (even poison use), and instead merely focuses on offering various new options for Pathfinder characters to make use of.
Dirty Tactics Toolbox follows in the vein of its predecessor “Toolbox” books: Ranged Tactics Toolbox and Melee Tactics Toolbox. And much like those two other books, I have the same basic issues with it. While it’s a perfectly functional book, there’s not a lot in it that really stands out and is memorable when compared with the vast amount of other options already available in the game. That said, I do think it edges out the previous two books by a small margin by having a few more things that did catch my attention and a few more instances of nicely integrated world flavour.