They're the weakest tank, they're the second weakest melee dps next to enhancement shaman that can spec to Elemental to bring more group buffs and more damage than a feral druid. They're overall at the bottom of the charts in every category. They're also the only melee class in PvP ...
(most of the time it is good enough, but we could include feral into that category), take for example a rogue, as combat they "can" pvp, but they won't get high ratings, as a mage fire or arcane isnt as good either, if we talk about warriors/dks they have one tank spec and ...