Pros

- Massive amounts of damage
- Escape mechanism
- Great Farmer
- Can out damage most other mid opponents

Cons

- Squishy
- First Priority Target in team fights

You can either grab Phosphorus Bomb for early harassment first or if you would like to play it safe like me, grab Valkyrie first.

Corki plays a important role in team fights, he does massive amounts of AOE damage to the enemy team, so as Corki your positioning is vital to winning fights.
Always wait until the tanks initiate and then engage very carefully, If you get focused, Use your Valkyrie and fly. Pop Q then E and spam R the enemy team will drop like flies :)
Here is a video to show you how to enter a team fight properly. Play Video