I've noticed that GamingForce allows only upvotes as part of the Reputation system. As far as I know, IPB also offers a Upvotes/Downvotes system. Do you think offering the members only the possibility to upvote makes the community friendlier or...? :huh:
In response to alakazam's question, I feel that it does in fact make a community seem friendly. It prevents users from abusing the up/down vote system when someone says something that they don't agree with, whether or not it's wrong to think so.
At the same time though, you have to have that belief that your members will do the right thing and not abuse the system.