While this isn't my area of expertise (and I mostly agree with you), obviously Warriors and knights have a very real advantage when tanking harder (eg. raid) mobs.
As for Shaman, my theory is that they overcompensated for the fact that Shaman can't rez (even though they're the Barbarian/Ogre/Troll equivalent of a Cleric), and to make up for it they gave Shaman too much other stuff. Either that or the devs were creating the world's first game of it's kind and just weren't able to balance 14 classes perfectly ... but I like to think it's because they wanted us to kick ass
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