The Operative/Scoundrel is hard to raid heal with if you're inexperienced with the class, reason being that if you're not up on your resource management then you'll be out of energy faster than any of the other healing classes..
This is not even remotely true. Commandos have the hardest ammo management bar none. Scoundrels raid wide healing and ammo management is very very simple.
Healing classes rented from easiest to hardest
Sage-simple, straightforward, powerful with simple resource management.
Scoundrel-more difficult than sage, very effective raid wide healing as well as single target, slightly more complicated ammo management but still quite easy
Commcando- hardest healing class in the game, requires a great deal of skill to use effectively and even then are under powered com paired to the other two classes, and have an unforgiving ammo management system.