Yeah mage is pretty much skill spamming in this game... the advantage of mage in this game is that they're very good at AOEing... (esp lvl 60, 67+)
the "skill" is probably how to case your skills and work around the cooldowns for maximum dmg... u may also want to try kiting (hit and run)
Later mage get a lot more variety in their
skills (fear, chain cast, stifle, spell steal)
Aggro is just something u learn.. let tanker stun before AOEing.. ready to pot/stone when u're likely to draw aggro through AOE... (mage does A LOT of dmg and its common knowledge that they're very good at taking aggro over the tankers)