Pros:
High dmg output
great stuns
good AOE dmg
good farming
good mid champ


Cons:
A bit squishy
will be focused
need to charge up stun

When playing annie, try to stun the most dangerous target from the enemy team, so your team will have a better chance to score an ace/survive.

When farming with annie, then use your Q (Desintegrate) to last hit minions; it has a good dmg to ensure last hits on minions, and the mana cost will be refunded by killing a unit.