Originally Posted by
Gemina
It's very situational, and not even a discussion until lv78 when the Regen kicks in. SS can kind of be looked at like a mitigative CD you use when your tank does not have one available, or simply is not using their mitigation tools. What this means is that in this case, your SS at best is helping to make up the slack created by your tank because your AF skills will always be more optimally used on Energy Drain.
In theory, it would seem like SS is very valuable on large pulls due to the constant barrage of auto attacks the tank is receiving. However, for very large pulls, all or most resources should be available and a good tank will know how to cycle their CDs to mitigate damage in a way that you don't have to burn up your AF on SS or Lustrates. This is even more true once getting Seraph, which makes large pulls a joke.