No this trinket is useful for other tanks but is a feral druid trinket priority. If there is a feral druid tank it should always go to the druid first. Here is why, first of all there are a ton of trinkets in the game that benifit a warrior or pally in terms of evasion stats. Gnomeregan autoblocker, and tons of others that either add shield midigation or block/parry.  Druids only have one evasion stat which is dodge. Though druids do have high armor and hp, the fact of the matter is druids inevitably take more damage if they dont' have high evasion than a warrior tank for bosses. Warriors/ pally's have parry dodge and block. Additonally block value miditagates damage physcially taken from each attack aditionally to armor. YOUR BASE AC DOES NOT DETERMINE HOW MUCH DAMAGE YOU TAKE as a warrior or pally !! so to compare druid armor to pally or warrior armor is irrelevant!! They physical damage done to both warrior and pally tanks is midigated by talents, or defensive stance for example that bonus, and shield block value.  DRUIDS DO NOT HAVE SHIELD BLOCK VALUE OR TALENTS TO REDUCE DAMAGE TAKEN THROUGH SHIELDS. Thus, AC is not a good indicator of how much damage someone will take. DODGE is all a druid has so if you let a warrior or pally tank take this trinket over a druid you are a fool. End of story. The evasion stats that should be stack the most for either or a warrior or pally is shield block % simply because a warrior gets more rage when he blocks and attack and with the prot pally talent redoubt , you can have almost 100% block % at times if you stack block. I play all 3 kinds of tanks , i know how they all work. SO LESS QQ.. dont STEAL THIS FROM A FERAL DRUID EVER.