What exactly is wrong with them, in your opinion? A game I play uses a Discord forum channel for their bug reports, and it seems to support all the features I'd need out of a forum: sorting options (date posted vs most recent/"bumped" threads), search, chronological comments, tags, media support...

The only real issue I see with Discord forums is that they're not public, so you can't view them without having a Discord account and joining the server. But as far as functioning as a traditional web forum, they seem to check all the boxes.