This is an electronic community, not "strangers" on the internet. You are my friend even though I will probably never know who you are. And I genuinely hate Double AA more than I hate some of my known enemies. This place isn't about strangers.
Karma as practiced here is 1) a violation of trust, 2) juvenile, 3) lends itself to abuse.
As I've said before, it wouldn't be so bad if they would limit it's use to once per user per topic/post. The once per hour is a bit much.
I don't care either way as I've stated before, but I've heard the arguments enough on my forums that I disabled them permanently. It lends itself to the equivalent of 'internet bullying'. When I installed the feature that I spoke about earlier in the thread, it reduced the amount of karma being given out in the negative, but those that did get it I got a LOT of 'report to moderator/administrator' emails for abuse. What I did do is enable a feature that allows users to thumb up or down a post without aggregating statistics on it.