The difference between a good DRG and a bad one is that a good one knows when to Jump. Not during an AoE attack or when you could get hit by a sweeping melee, I usually incorporate them when Life Surge or Power Surge is ready, one goes with Jump since that often does more than Spineshatter Dive, and then Jump again, and then Power Surge is back up. Focusing on your rotations should be first, if all of those are up then go for it.