Puncture Skill - Worth it?

I got a Knockback Ranger with King of the Hill.

Critical chance from King of the Hill was not a very powerfull boost. I want to respec it later... I would not recommend it.
Knockback gem and projectile weakness with Faster Attack is trully what you need for knockback.
I got all the way to Fencing, taking Iron Grip on the way, and I find it more usefull than King of the Hill, it's not very that far when you take the life wheel on the center.
The extra knockback with puncture is good on pretty anything. Jumper will not jump if your just enough close and will constantly try to reach you, you also cancel their jump. Ranged will go off screen and walk back. Cyclone is the only thing that is not working.

Increase Critical Strike and Increase Critical Multiplier is beautiful on Puncture, it does wonders, and even if I got hurt on reflect mobs with a big crit, the degen is fabulous.
My main skill is RoA though (Conc.Eff. + PPAD hurt but cost a lot of mana).
I use Puncture versus group less than 3 enemies or too dispatched and on boss (and on reflect). I use Puncture until I crit and they usually die before reaching me...
I didn't test chance to flee, but I leveled the gem. Need slot.

As RoA is my main, I don't want to take DoT damage, just physical.
If you want to burn and proliferate with punture, just go for Burning Arrow...
LMP, GMP or other damage reduction is bad for Puncture, either you do a lot and the target bleeds a lot, or you do little and the DoT won't be impactfull, stick with Chain Split Arrow in this case.