I thought Sir Christopher Lee did just fine. He did much better than most actors in the Prequels.
The thread is about the best of Star Wars acting. Christopher Lee is without a doubt a great actor. However, (and this is just my opinion) in the Star Wars Saga, he literally sounded like he didn't even know where he was. Blame it on the blue/green screen sets or what not, but IMHO he was not good in Star Wars.
On a side note, I don't care too much for TCW's Count Dooku. I don't get the same vibe from him as Sir Christopher Lee. Not that anyone could actually replicate Sir Christopher Lee, but TCW Dooku doesn't feel like Dooku to me.