Yes, although it could be mitigated, by having different sort order options and allowing users to adjust scoring options, including to accept or disable scores put in by others. (Local scoring is something often done in NNTP. Some NNTP clients also support global scoring, although a better more simplified and general format suitable for many programs might be helpful, and must ensure that users can easily disable that feature if it is not wanted, as well as to adjust weights that apply to it.)