I think due to the "rep war" and rep turning into basically a chat room for rep spammers (not really innocent here) it's been removed. It was kinda easy to abuse >.>
Figured something would happen eventually--it was kinda ridiculous.
Perhaps we could have a limitation of you're only allowed to rep the same person once a month, and you can only rep 2 or 3 people per day. That way it's actually reputation instead of a spamfest.