Mage Strengths are World of Warcraft Trading Card Game
Mage Weaknesses are Flammable Card Stock
more seriously...
Mage Strengths are Powerful Card Draw, Interrupts for all card types, Damage Dealing, Mass Ally Removal, Equipment/Ability control (but rarely outright removal), Efficient Healing, low cost cards, and the ability to play extremely quick, slow, or midrange decks.
MageWeaknesses are low starting health, poor weapons and armour.
I suppose you could argue that while Mages CAN answer anything you can't really fit all those answers into a single deck. Mage decks are very different to each other (30 allies in Black Ice, 2 in Varanis) and they all have to leave out some of the strengths listed above.

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