Sorry but tau anti-air defenses are VERY difficult to be "neutralized" in likely a single turn.
I'm not saying that it would be impossible to pull this off, but I wouldn't expect it against Tau honestly.
As for the book - I'm comparing it directly to its predecessor - the aforementioned Tau. That book is a much more solid 6e codex than this book that has more questions than it does answers.
I started a list on G+
Why don't farseers have ways to mitigate random psychic powers?
Why don't swooping hawks interact with flyers?
Why don't our flyers have ANY defense upgrades whatsoever and cost MORE than most flyers?
Why do banshees just plain suck?
Why does the falcon even exist when the wave serpent is better in every way?
Why does the wraithknight have 4 weapons but can only shoot two?
Why do Dire Avengers have, of all things, counter attack?
Why do shuriken catapults still suck with their 12" range when the average charge distance is 13" and rapid fire weapons are now move and fire?
Why in the hell is the wraithknight so bloody expensive?
Why is the Dark Reaper Exarch the only one thats able to get Flakk missiles?
Why does Illic have a badass gun but still only wound on 4's and is still vulnerable to Look Out Sir? (Looking at you vindicare)
Why do the Phoenix lords still have super-expensive costs and most don't have invulnerable saves?
Why can't the Avatar get battle fortune exarch power - but can get 4 that are COMPLETELY WORTHLESS to him?
Why do swooping hawks even have haywire grenades when they will get blown off the table the second they land?
Why is the Autarch literally copy and pasted out of the old book? Did PK not get the message that the Autarch is horrible?
Why does the whole army rely on rolling 6's to do well?
You will likely incur some useless snarky remarks for that post, but those are all good and valid questions. Too much of the codex screams of neat ideas that weren't thought through, half-baked ideas, and unfinished work.