Strengths:

1. The best magic damage dealer. 
2. One of the best range classes along with hunters.
3. Good combat control with Polymorph.
4. Can summon food and drink.
5. A great choice for grouping.
6. Strong solo class due to snares and massive damages.
7. Can open up portals to go to major cities.
8. The best area of effect damage dealer in the game by far.

Weaknesses:

1. Can only wear cloth.
2. Not healers in battle. 
3. Major target for monsters due to high amount of damage.
4. Most damage dealing spells are not instant