We used to have this system for events and it was abused badly. Read this thread if you want to know more : http://www.urban-rivals.com/community/forum/?mode=viewsubject&subject_page=5&id_subject=1646705
If it makes you feel any better, I only disagreed because you begged for agreement. And in hopes that there was a secret thumbsdown emote. Considering we have six varying degrees of happy, two separate sleepers and a dead guy, a thumbsdown would make at least as much sense as any of those.