RepBot, in its original concept, was an interesting and useful tool. Kudos to burper for introducing it. Unfortunately, it's design also laid it open to abuse and manipulation. I've seen jerks use RepBot to drive new users away from FIBS. What a laugh those jerks had! And of course we all know, or should know, about the sale of RepBot vouches. In this sense, RepBot has been abused by at least one of the greatest abusers of the FIBS ratings system. And there is the clicque behavior.
The only objective, and therefore most useful, feature of RepBot is its list of the number of a user's saved matches. This info is available elsewhere, but RepBot is convenient. Other than that, I won't be sorry if RepBot never returns, since some of the worst users of FIBS have figured out how to turn it from an objective tool to a weapon of abusive manipulation.