Give operatives dual wielding, maybe it will help balance them out.
Just operatives? That would make every ghetto gangsta wanabe play operatives, giving birth to the rash of ninja operatives every one feared before they realized every one was a ninja...
Besides, operatives melt faces. I'd argue that they can tear things up at least as much as a good soldier, if not better. They cause chaos and disarray to what was previously an organized movement, can turn enemy emplacements against them, blind them to oncoming traps and slow progress. They can move virtually undetected, while spreading death and stealing command points.
Good operatives will regularly see 7-10k xp per run. More even if you xp [censored]. They sneak in, and can change the tide of battle, and turn a previously well fortified position into a death trap for the enemy.
Of course, the AI is too stupid to take advantage of the gaping holes you create in defenses, but online its beautiful. Also besides the point.
In the end, i still insist that a single pistol is already lethal and dangerous. The reduced accuracy of dual pistols would be so much, and the downfalls so bad that you wouldnt want to bother, save for a change of pace.