Fracture is quite good, it's like a 300 potency hit, but actually i use it very rarely, you can use it for an extra DPS, but yeah, it's not necessary. Never use skills without combo (SK BB etc.), avoid/stun aoes, mark enemies, comunicate with people and stuff like this.
This is tanking before 33. After you have important skills as Inner Beast, Storm's path, vengeance and infuriate. IB heals you for 100% of damage, so if you hit or 300 you will recover 300, it's not that much, but yeah, quite useful. The important thing about IB is the 20% damage reduction for 6 seconds, that's a HUGE buff, it will be your main mitigation skill. Use it before big hits, or immediately if there aren't big hits.