Russian World of Tanks forum administrators have decided to completely disable the negative reputation on forums and leave only the "positive" green arrow. The declared reason is the "fight against negativity". The Russian players seem to be quite happy with the change and many mention that it's going to hurt negrep forum trolls.
Others however point out that the developers were tired of seeing a lot of negative reputation on their posts. It is not known whether this change will appear on EU and NA forums or not.