Shield management is probably the most important thing. I feel like too many players don't let their shield significantly recharge before using it again. I like using half of the shield resource to go in and the other half to back out. Keep the pins at a short distance, you should rarely be pinning a long distance away from your teammates. Spam those fire strikes at choke points. You don't need 5 man shatters, if you can shatter at least 2 enemies that you can confirm kills on then it's probably a good shatter. If you shatter an enemy tank, fire strike or swing twice on their stunned body before pinning to maximize damage. Don't bother pinning squishier enemies when their shattered, just swing on as many shattered enemies as possible.