Not sure whether it's for me to say, but some people may not know how to use the rating system on the new forum, and I haven't seen any threads explaining how to do so.
You may have noticed that at the bottom right of every single post, there's a + and - sign, that will have a '0' in when it's first posted, if you press +, it'll go to '1', and if you press - it'll go to '-1' (assuming that nobody has pressed it), by doing this, it affects the rating of individuals in their profile, which can be viewed by clicking their username by the side of their posts, in the thread title etc.
How you should see it is a thanks system, similar to those on other boards powered by vBulletin, so every time you see a helpful post, you give it a +, if you see a negative, unfriendly post, give it a -, this should help to deter individuals from saying bad things or spamming, and encourage people to help, which is always the best thing for this forum.