I like Nicky and Robin best - they are both very experienced skaters and their comments are always fair and constructive.
Karen is also very experienced, obviously, but I find her too emotionally involved sometimes. I thought last year it was a mistake to have one of the judges involved in the couples' training, and I still think so.
Natalia is very sweet, but her comments (when she is allowed to make any

) tend to be a bit 'light'. I suspect that's partly the restrictions of having to comment in English though.
I wish Jason would stay away from making personal remarks about the skaters. Some of his comments regarding presentation are spot on, but they get lost in the 'offensive for offensive's sake' stuff which is all the audience/voting public remember. I'm sure it's caused sympathy voting in the past which has resulted in the wrong people going