On the plus side, Ingrid makes a good villain due to her calm, methodical approach. Considering the time she had to spend waiting for that 'perfect' third sister her having a long range view of things is not surprising. I do like her jousting with Rumple- they are equal in many ways, respect the others power and are constantly trying to out maneuver each other.
I also like the fact that her plan is pretty creepy. And she's a big improvement on the Wicked Witch.