We had it for a while, but then the site administration decided to remove the score system a few weeks ago. One reason I'd guess they did so is that it had the capability to distract from the site's main purpose of discussion, as some people could be less likely to post content that had the potential to be viewed as controversial by others because then their score would be lowered from negative reactions to that content, so they'd be discouraged from sharing their honest thoughts. Besides that, most felt it just wasn't a necessary addition to the site anymore, as it didn't really seem to serve a purpose that anyone cared about.
