Ninjas in its current form...how big a difference do the bow attacks make?

[Lazarillo]

I had a Ninjas/Thermal a while back that I never really got off the ground, been thinking of giving it another try, but since I tend to "pre-build" stuff in Mids and then buy enhancements when creating new characters, I'm looking at the build from before again and sorta re-trying things.  One of the big, notable aspects is how HC changed the bow attacks to add a Crit chance to all the pets.  So with that, how big of a difference does it make, and how high should it be prioritized?  Based on my previous experience, working the attacks into my actions frequently enough to keep them shouldn't be terribly hard, but should I definitely be taking all three?  Or just two (for my Necro/Electric I used only two and it still seemed to provide decent benefit).  Any other tips to be aware of?