On the plus side, Reddit has a low bar to entry. It's super easy to find or create a forum for a topic. You don't need to create a new account, and you can view threads from across your interests in a single view if you want.
On the other side, Reddit has many issues:
- Tree-style comments are not the best format for every type of discussion.
- Upvoting encourages content that gets votes: groupthink opinions, short funny quips, generic memes, etc. These can bury deeper discussion or dissenting views.
- Reddit as a whole has its own culture. If you don't like Reddit's culture, it's unavoidable.
- The visual focus of Reddit's recent redesign means that many hobby subreddits turn into posts showing off gear instead of discussion.
- Aggressive moderation on some subs makes it hard to post. Posts might be deleted for arbitrary reasons. Sometimes questions are sent to a generic 'Ask a Question' thread, which isn't great for finding questions later via search.
- Your post history is public across the site, which carries privacy risks.