Evil/corrupting infleunces should be rewarding enough that characters with desires other than "I like murdering people" should consider succumbing to temptation. Especially in a game whos entire premise seems to be fighting off this tadpole's corrupting influence.
I agree that the current tadpole incentives are a bit underwhelming. Why mentally influence this enemy when I can normally convince/intimidate them or just beat them up? On the other hand, we obviously can't have the tadpole be so strong that it trivializes the game. Significantly better low-level items and tadpole combat powers would work well for this: they'd be overpowered at low levels, but only somewhat effective in mid-late game.
