I’ve seen forum plugins (for other forums) that have had the feature for a while… but they can be abused or taken personally by the OP. Hence I think ideally they would differ depending on situation - so automated news threads could have things like downvoting, but maybe not such a good idea if it’s someone’s personal thread, or when they post pictures they’ve taken etc.
On one forum we added a C&C flag that users had to set in their profiles if they were happy to receive critiques on their work/photos. Giving (and receiving!) critical feedback can be hard 