Recently I re-speced to 1 Charge, 9 Rhino Might, and 0 Stoneskin just to deal with Humanian Yetis. To my surprise, it made quite a difference. At level 9 Rhino Might has a 100% stun rate and 7m AoE, almost as good as Holy Tempest. The damage sucks, of course, which is why I initially dismissed the skill. But 3 seconds of stun keep your fragile bird/enchantress friends alive, allowing them to do their proper job.

With a second bear/rhino in the party, Rhino Might has a perma-stun effect. Suddenly, a map like Lost Villas becomes accessible to non-elixired parties.

I might have to reevaluate the usefulness of this skill.