Yeah, I love Grievous' back story. The Clone Wars did a wonderful job portraying him. They really took into account his failing health and physiological characteristics and all those other things that makes Grievous Grievous.
Ooooo and Cad Bane. He was awesome too. I can't wait for Season Four~ I didn't get into the Clone Wars until really late (like, a month or two ago late ._____.), but I went out and got all the seasons on DVD. The special features alone are worth the price.