i did some testing in WA last boss. I tanked the baron and let my pet tank the chick. It took me exactly TWO hits to take aggro back. Agreed i have a Hatred, but he had PLENTY of time to produce aggro. If it takes me 2 hits to get aggro, imagine a mage or warrior in his burst phase...yeah...Spirit of the Oak is NOT a pet. It can be used to hold a mob at one spot (works well for Blogus in RT) but that's it, at least end-game wise.