I suggest to use an h-index-style to indicate SE users performance. As with publications, it gives a direct indication of activity level and users interest.
The h-index for answers (for example) is calculated by arranging the answers in descending order and stopping at the answer that has an equal number or higher of votes as its order. For example, a user with 15 answers with the following votes: 50, 43, 42, 20, 15, 14, 14, 11, 10, 10, 8, 4, 2, 2, 1 will have an h-index of 10, while a user with 1 answer of 246 votes will have an h-index of 1 (although both has same number of total votes).