Concealment/Scapper is a one trick pony. That trick is the opening rotation. That trick is powerful but it is not without counters, especially in a team environment. CC/Roots can disrupt the opener allowing the target to kite, which an operative has a hard time recovering from with no gap closer. Guarding/Taunting helps to mitigate the damage as well as turns the burst into much more manageable damage. Then you can heal the damage, because after the initial burst the sustained damage lower than other classes. It is funny when people complain that they have to use their CDs to beat Ops, yet for the Op to deal that kind of damage in a short period of time they are blowing CDs of their own.