You're suggesting hunters can't tank bosses is what I'm seeing. You'd be surprised, considering that in Cata Atramedes was solo'd as a hunter, most of ICC was solo'd by hunters, Alyrazor was soloable then too. Almost every heroic 5 man boss was also soloable.
Get a turtle/beetle and watch it tank. Suggesting that hunter's can't tank what is considered solo content (or even on occasion, near current raid content) is absurd unless you've never taken a look at what they can do.
I guess you're right, the hunter itself cannot tank at all. But you really should give the pet's some credit, can link some videos if you want from what I've personally done when I still played or find other relevant vids.