The standard attack deals a lot of damage so you'll kill most things you attack. The charge attack deals more torpor and deals lots of damage to structures. My low level tribe uses 4 of these to attack structure while we use other Dino's like raptors and trikes to attack the players. They can be tangled in a bola.
The first time I heard one of these little critters, I thought, hey is that a goat?! Anyways, they are fun to have around and tamed, as they knock things out and run pretty fast while charging. However, they have considerably low health and stamina, so they can be quite troublesome when low lvl. But who cares, they make goat noises. If only they could eat anything
While not the best fighters pachy's make decent early travel mounts. Their base speed isn't all to high but using the alternative attack will cause the pachy to charge forwards are decent speeds and dealing a fair amount of torpor to what ever they hit. Pumping movement speed and stamina will have you moving around the map with ease.
Its charge attack is significantly faster than its sprint- I can easily leave my tamed carno in the dust with it.
Just keep in mind that you can't turn, and easily get hung up on even small rock-piles when charging.