yup, a silenced terra on single shot is surprisingly accurate.
for mid range shots (like the boat room scenario) is very accurate.
for long distances (like sniper tower to walkway on outpost), its good ( probably as good as the pavlov, assuming you have time and a still hand).
for extra long shots (like memorials start areas up high, from one side to the other), its no sniper rifle but it CAN hit (though no chance of me killing someone there, i cant get enough shots to kill before they run- some can though).
the scopes will aid your sighting of targets but with the silencer you will have a more accurate shot, all it takes is nerve and a cpl of seconds to take aim.... then "Pppfffff." (silenced terra )