I've only been here about two weeks, and counting Points is not a major issue, but:
It bothers me that Disagree deducts from your Points. You can't discuss openly without disagreeing with somebody, and it's not healthy to punish people for that.
On the other hand, I would say Abuse should deduct two points. And probably Troll as well, although the problem is people tend to play fast & loose with that term, so maybe not.