Like Conan said, it's a very focused product. Wire-Fu shows you how to use the mechanics for combat and Honor-related social actions. To be honest, I just use a single roll for most non-combat actions: no Yin/Yang split, no Chi, just whoever rolls the most successes wins. (Wyrd-Fu will be all about spellcasting, but it's still in the works.)
On the topic of GM advice...
Conan's right: Wire-Fu is written for experienced GMs. Again, it's that tight focus. I just didn't have anything new to say about scenario construction or GMing techniques, so I didn't. My readers can get better advice from other sources.
To Conan... thanks for the frank and balanced review. I always appreciate a considered opinion. Lookin' forward to your playtest reactions
--Dan Bayn