I like the top users feature. It brings out my competitive spirit.
The one thing that bugs me about it is that as far as I can see, it is not affected at all by the number of accepted answers. It would be nice if this was included in some way. Even if it was just another column by the number of questions answered and up votes.
It may help people judge someone’s ability in a tag. If there are two people with similar numbers of questions and upvotes one may have written something on a popular question, and a load of tosh on numerous others. The other may have spent time answering in detail other non popular questions and being accepted. Especially with the CV thingy it may be important to note such differences