If you've ever been deposed (and I have), then you know that Gates' approach was close to optimal when dealing with lawyers.
Bill's biggest mistake was having a terrible attitude and bad posture when answering questions. He made it too personal. Otherwise, the strict answers were mostly ideal and are often used as tutorials by attorneys to show those two things:
1) How not to have the posture/tone/etc in your voice when answering questions, but...
2) ...that this is an adversarial discussion and you should seek extreme clarity every single time.