The expansion is retardedly easy. By the end of my first playthrough I was doing 300dmg backstabs. Combine that with endless flurry and the invincibility talents and my rogue was soloing bosses.
The kitty also removes any and all need for strategy. I beat the marsh dragon by just spamming the kitty effect - up, slash, slash, dead, up.
Mage is fairly shitty unless you do Primal anyway. Blood Mage was relatively useless.
Blood mage and spirit healer were the only specs worth getting. Primal was redundant, I thought spirit was the best mage tree by far, even if you try not to use the taunt/FF combo.
I have all of the achievements, and playing through as a mage 4 times won't get you a level 20 warrior/rogue.
And playing a rogue 4 times won't get you the mage achievements. Whats your point?
I like posting.