It should be noted that Nimoy's greatest failure as a ST director was ruining Saavik. Nimoy had Robin Curtis play Saavik as a straight Vulcan. She's essentially a completely different character in III, and is basically the original cast's Wesley Crusher.
Ironically, Robin Curtis played a Vulcan in a TNG episode who had gone nuts and displayed real emotion. It was a far better portrayal than her sad, wooden Saavik.