Strengths:

1. Has various pets. 
2. Can summon a mount at level 40. 
3. Great for debuffs. 
4. Can summon/teleport group members.
5. Great for crowd control.
6. Strong in both PvP and PvE.
7. Has a high amount of stamina.

Weaknesses:

1. Not as good a damage dealer as a mage.
2. Can only wear cloth.  
3. Hard class to play. 
4. Not one pet fits all situations