Pros / Cons

Pros

+ His E does TRUE DAMAGE at no mana cost!
+ Healthy and durable even with no items.
+ Ungankable with ultimate available.
+ Has 2 attack speed buffs.
+ Manageable mana costs to his abilities.

Cons

- Lacks hard Crowd Control.
- Can be harassed by ranged champions.
- Before level 6 easy champion to gank.
- Average farmer.
- Can fall-off late game.
All his abilities merge well together and he can sustain a lot of damage. One if not the best off-tank in the league with an ability to deal true damage to other tanks.

He does lack crowd control and that could be a problem in team fights. That being said, he cannot be affected by crowd control when his ultimate is on and since a tank or off-tank's job is to get to the enemy ADC/APC, there's no one better than Olaf to do that in all of LOL. Giving him a stun on top of that would make him way too powerful. Play to his strengths and you'll do great.


So why u should pick olaf to jungle?
1. FAST!
2. Early DMG
3. Nice lifesteal
4. Good slow
5. Easy champ
6. Ultimate is powerful vs. enemy who have hard cc

Abilities

Passive:
Berserker Rage
Olaf's attack speed increases by 1% for every 1% of his missing health.

Undertow
RANGE: 400 - 1000 COOLDOWN: 8 COST: 60 MANA

ACTIVE: Olaf throws an axe in a line to a target location, dealing physical damage and slowing enemies it passes through for between 1.5 and 2.5 seconds, depending on the distance the axe has travelled.
The axe remains at the target location until Undertow is off cooldown. Olaf can pick up the axe to reduce Undertow's cooldown by 4.5 seconds. If the axe would land inside terrain, it will instead stick to the wall.

PHYSICAL DAMAGE: 70 / 115 / 160 / 205 / 250 (+ 100% bonus AD)

SLOW PERCENT: 29 / 33 / 37 / 41 / 45%


Vicious Strikes
COOLDOWN: 16 COST: 30 MANA

ACTIVE: For 6 seconds, Olaf gains bonus lifesteal and bonus attack speed. During this time, Olaf also gains 1% enhanced healing from all sources for every 2.5% of his missing health.

ATTACK SPEED: 40 / 50 / 60 / 70 / 80%

LIFE STEAL: 9 / 12 / 15 / 18 / 21%


Reckless Swing
RANGE: 325 COOLDOWN: 12 / 11 / 10 / 9 / 8 COST: 21 / 34.5 / 48 / 61.5 / 75 (+ 12% AD) HEALTH


ACTIVE: Olaf attacks with such force that it deals true damage to his target. The ability's cost is equal to 30% of the damage dealt and the cost is refunded if Reckless Swing kills the target.
Olaf's basic attacks will reduce the cooldown of Reckless Swing by 1 second.

TRUE DAMAGE: 70 / 115 / 160 / 205 / 250 (+ 40% AD)


Ragnarok
COOLDOWN: 120 / 100 / 80 COST: NO COST

PASSIVE: Olaf gains bonus armor and magic resistance.

ARMOR / MAGIC RESIST: 10 / 20 / 30

ACTIVE: Olaf instantly removes all crowd control effects from himself and becomes immune to them for 6 seconds. During this time, he loses the passive bonus but gains bonus attack damage.

ATTACK DAMAGE: 40 / 60 / 80


STRATEGY

Early jungle
-Make early backdoor ganks
-Buy lifesteal so u cant die easy
-buy boots
-use ult when someone stun u

In tf
- if u have tanky items, u can go in first and use ult to waste enemy cc.
- if u have more dmg than tanky go after fulltank
- focus adc/apc/assassin first