Some of the ENC pets were actually a Rogue class when summoned, but never given the actual Backstab ability. This was of course confirmed by ShowEQ and/or MQ2, but the way you could tell which pets were NOT Warriors is that taunt didn't always happen with every Enchanter pets.
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As to the agro issues. It varies. I do think that the resist agro is perhaps slightly too high, but I also think it depends on your tank. For example, an SK tank can hold agro from you pretty easily, where a warrior will lose it a bit easier. But if you're using your pet as a tank, (or trying to) the taunting of the pet just isn't good enough, especially at lower levels, simply because of failed taunts... Taunt itself does very little agro, but the function of taunt is to immediately put you to the top of the agro list, regardless of numbers. So he might get agro, but depending on what you have on the mob, and how often you're nuking, you could regain agro very quickly.
It's always been that way.
Nuking does also seem slightly high, I shouldn't be able to pull agro from anyone if they've done 50% of the damage with only a single spell. (i.e. pet)
But I personally have already grown accustomed to that and plan for it.
All of that said, the only things I think needs slight (and I mean slight) adjusting here is nuke agro, resist agro and the previously mentioned mem blur chance being raised a bit. (it fails far too often)
Everything else seems almost right on.