Really depends on the situation, honestly. For single-target, it can be a decent damage boost... assuming you can break the shield in a reliable manner on CD. For larger AoE situations, the damage is pitiful since it's split between targets and becomes the equivalent of an extra GCD for Swipe/Thrash at best. I tried using the trinket this week in M+, and even in >+10 I had issue getting the bubble to consume on single-target (actually sat so I'd get crit to break it). Was a nice little boost of AoE threat on trash thanks to Skittish when picking them up, but that's about it. Regardless, from the DPS perspective, if you don't have anything better in the trinket department, then go for it.
Survival-wise, it's pretty solid I'd say. Again, I had issues actually popping the bubble on ST, which means yay for surviving and boo for the damage potential. At he very least it's a nice stats stick with benefits.