Pros

Incredibly mobile

Can kite just about any champion in the game

Great for pick making or follow ups due to her mobility combined with Charm CC

Kit has amazingly good synergy with items like Luden's, Lichbane and Rylai's

Very versatile in her build options

One of the strongest midlane gankers

She is a sexy fox human hybrid

"Burst" mobility makes her often overwhelming to face as a champion reliant on skillshots
Cons

Skillshots on Q+E and short range on W lead to somewhat unreliable damage sometimes

Brush(and lack of vision) screw her W/R targeting over

Charms high mana cost(85) make it a punishing spell to use in lane if it misses

Naturally a very squishy champion. A caught fox is a dead fox.

Shutdown by movement impairing effects can make her an easy target in teamfights

If you have a bad game, you are next to useless as you offer less than average utility for teamfights

Extremely close range for a mage, has to use her mobility/kiting to keep herself alive when so close to the enemy