I been looking at Cunnings stat tree, and while, it is namely built for PvP. It does seem to have a few useful PvE Features, like restoring 30% of your mana, causing less Vipers, and a 16% extra damage on targets with 35% Health.
The MM Hunters Pet does usually about 10% DPS, and with the Cunning, it does about the same.
If you put aside Wolves, and the Ferocity Tree being built for DPS. Could you see a Cunning Pet inside a raid being useful with a MM/Surv Hunter?