Maybe you need to PVP more. They are not OP, their damage does not need to be turned down, it needs to be high because they can do nothing else. If you target them while they are uncloaked, you mince them.
They are nowhere NEAR the gods of PVP. Go and actually PVP. Every class has something that seems overpowered. Every. One.
Just because someone lost to a competent scoundrel/operative in PVP does not mean they are OP.
Practice alot in PVP and scoundrels will not be such a problem