Cunning get chimeras and silithids, each who have a previously used abilities with the poison bonus. Great for pvp.
Unfortunately, tenacity exotics don't have much to brag about. Tenacity, are the staple leveling pets, and neither the worm nor the rhino can help quest as well as the non exotics. Bears and crocolisks can hold aggro better and on multiple mobs, and the turtle is the ultimate soloing pet able to solo 5man quest mobs with ease.
My hope is that with Cataclysm coming that they add a tenacity exotic who has the ability to take hits like a turtle, and hold aggro like a crocolisk. Maybe a spiked shell talent or something along those lines. Hey, why not have a pet that can buff itself similar to warlock pets in addition to it's shell defense.
Just an idea... I ended up using a turtle to solo all Icecrown 5man quests except basic chemistry, but I almost felt like my beast mastery talent went to waste. Maybe turtles are just that uber!
