I've noticed that most of these "feelings" she gets are things that any intelligent, perceptive human being could extrapolate on their own. I'm no more psychic/empathic that anybody reading this post....yet I can tell whether or not someone is telling the truth by their verbiage, body language, and by whether or not their story makes logical sense.
It doesn't take any special alien ability for a regular human being to know whether or not someone else is lying, or to determine what emotion another person is feeling; all it requires is a brain and a talent for observing human behavior, that's it. So other than her wonderfully delicious tour-de-force in "Face of the Enemy" Deanna Troi, while very kind-hearted, was essentially a worthless character.
It doesn't take any special alien ability for a regular human being to know whether or not someone else is lying, or to determine what emotion another person is feeling; all it requires is a brain and a talent for observing human behavior, that's it. So other than her wonderfully delicious tour-de-force in "Face of the Enemy" Deanna Troi, while very kind-hearted, was essentially a worthless character.



The trouble is, the scene does not feel like altering character mannerisms for the sake of narrative, as Troi was teaching a variant of "poker face". But there could be maneuvers he might not know, or any old response could be seen as a random act. Or Troi was lucky, how did she know how many patterns Data was aware of and could process in the same timeframe? At least Data is faster than an Atari 2600... ever try playing chess on that? 