Looking at the enemies in back of the book, I'm wondering if perhaps the Tau weapons may pose a bit of a problem to PCs compared to Chaos or Tyranid weapons. Note I'm only really looking at the Troops and not at Elites and Masters (who should be able to really hurt the PCs).
Look at Fire Warriors and Gun Drones, armed with Pulse Rifles and Pulse Carbines respectively, each doing 2d10+2 E damage with Pen 4. That seems kind of much compared to the Troops of Chaos or Tyranids, isn't it? I know Tau weaponry should be stronger than most, but it seems kind of much, and potentially lethal to a PC if the GM ends up rolling well. And the fact that these two might be made into Hordes with those weapons seems even more dangerous. I know the obvious answer with Tau would be to engage in melee, as they suck in that regard, but they still might get some shots off before they're engaged in melee and could stop a charging Marine in his tracks.
I don't know, maybe I'm just blowing it out of proportion, but I still don't like the looks of the weapons of opposing basic troops cause that much damage. What would players and GMs say about this?