Yea, Primal compared to the argus' animus... whatever it is called... is a really big part of Circle. Our wolves don't hit super hard when compared to things that trot around with 20+ Arm, but with Primal a stalker warped for strength is swinging at even dice, and a feral is only down one or two, with lots of attacks. Attacks that almost certainly hit as well, due to the +2 Mat.
Generally you want to be using Primal when a model HAS to be gone, like a jack contesting a zone or blocking an important charge lane, or being big and scary. More importantly, especially with the Stalker sitting at Mat 6 base, Primal lets you hit casters with a fair bit of accuracy. Who cares if they would Frenzy next turn if the wolf ends his activation gnawing on the severed leg of the enemy caster?
Ferals with Primal hit even the most dodgy casters on average dice. You don't even need to boost.
Generally, I find I use Primal maybe one or two times a game. I generally Frenzy as a result zero times. The wolf was either a sacrifice to trade for some bigger piece, or I just won. In both cases, Primal made the game.
One thing that really shocked me when I started playing Hordes was how much little stuff like +2
Str and Mat really matter. I remember looking through some of the books and wondering how a Feral with P&S 15 base was supposed to do anything to a Juggernaught with 20 arm, etc. Hell, the jugger costs less and swings at P&S 19! I found out later that with controlled warping and Primal, the wolf will just shred the jugger more often than not. There were a few games where I had to figure out what to do with my other beasts after accidentally one rounding an enemy heavy with a feral or stalker.
And man... did I feel like an idiot when I finally realized why Shifting Stones were good
Not only good, but amazing. My face palm of shame could be heard round the world
Automatically Appended Next Post: Oh, another good use of Primal is on the Gorax himself. He hits pretty hard then, and it isn't like he was doing much anyway if he Frenzies next turn; he is pretty much an ambulatory animus. Plus he can throw things 5" with Frenzy up, and has just enough Fury to Primal, force to throw and boost the to hit. Fury that is going to go away automagically the next turn anyway. Since it is a two handed throw, you can whip the enemy model at another enemy model too, rolling on Mat 8 to hit. Good times all around.