when I use this ability with only a single target, do I get any kind of damage buff at all over using my normal weapons?
For Tier 1 Bridge Officer abilities (Tactical)
Torpedo Yield - Primary Choice for Escort Classes
Beam - Overcharge - Second choice for Escort Classes
Tactical Team - Generally for Cruiser/science Classes for tanking and healing purposes.
Boarding Party arguement, As an escort class, you are generally faster and normally wouldn't be close range to enemy ships using Boarding parties, your ability to switch to attacking boarding party shuttles and torps will grant you no reason to take Tactical Team.