Obviously, it changes over time. Some members change their opinion, some delete their accounts and their friends and black lists cease to exist.
Note, that number of people who have blacklisted the member has more weight than number of people who befriended the member. On average members have 10 times more people in their friends lists than in their black lists. Therefore the system gives more weight to the "blacklist" number.
Don't ask what you did wrong to get blacklisted. We don't know whats inside of people heads. And no, you can't see a list of members who blacklisted you. Unless you are a premium member.
Number of members who befriended wanker84: 0
Number of members who blacklisted wanker84: 0
Number of members whom wanker84 has blacklisted: 0
Overall rating of wanker84 is: neutral
(rating can be slightly out of sync with numbers, because it is calculated once per 24 hours)