Our 90s talents are lackluster, as well as our other tiers of talents. Incanter's ward, pure PvP talent. Invocation, useless as Rune of Power is much more worth getting and this talent is tedious to keep its buff up and can conflict with our rotation. And Rune of Power isn't that great. It is an AOE buff that depends on where you set it you MAY have to reposition it a couple of times during a boss fight but that is all. I would have much rather just preferred Rune of Power to be a buff like arcane brilliance, but this would conflict with PvP. Balancing mages around PvE and PvP never goes too well.
I would say roll a warlock. Coming from a mage, dear god just roll a warlock. Mages were fun and had flavor to them in WOTLK and BC. They aren't what they used to be. I just recently rolled a warlock and I am definitely going to make it my main as I am having so much fun levelling with it in Destro Spec. I don't feel right playing a warlock as I am so used to being a mage, adjustments will have to be made. And don't think that just because they are both pure DPS classes that they play the same, because they are polar opposites of each other.