The walrus may hit hard, and take a lot of damage. But it's got all the mobility and utility of a rock too. If you think these things are unimportant, then go ahead and roll a walrus. Be king of the MUD.
That equals - hard to kill, but easy to escape. If you're dying to a walrus you're either being ganked or an idiot, which means your chances of you killing it, over it killing you, are comparitively high. It's similar to the theory Paladins work on, except further down the sliding scale into uselessness.
You may lord the Walrus as an insane tank of all nastiness, but it's essentially dead if you can maledict at all.
Yhorian