Concealment is terrible, you really need to play lethality these days to kill anything. Healing is still better even if one of the most important talents is broken.
I've had a pretty average damage around 500k per game before the surge nerf. My best post tripple nerf was 719k on a voidstar. (this is as lethality)
That being said, the spec still sucks. Yes the class maybe? can do okay damage, but it probably has the worst utility in the game. The single target damage of concealment is also lower than that of the most similar melee classes, lets say assassin and marauder. Both of which have 3 superior defensive cooldowns compared to the two jokes an operative gets.
I don't know how they can fix the class without breaking it again but it needs some love, in utility or survivability if not damage.