@reconzeroI think Conduit is pretty decent. The temporary shields Tactical is good, her Passive is very helpful (especially for newer players who lose track of their teammates a lot), and the Ultimate can be really good when used in the right situation.
What ability set haven't they done enough with yet? All of them are based on some aspect of or activity in the game - weapons, ordinance, movement, vision, looting, healing, shields, etc. I'm personally struggling with new ideas at this point with 25 legends already in the game. Just not sure what they're going to come up with.