- Annoying interface.
- Categories, not tags. (Any forum I switch to must have hierarchical tags instead of categories.)
- Non-threaded discussions. (Ditto.)
- I'm not a fan of Ruby.
- Uses Gravatar, which never works correctly.
- No watchlist?
- "User-controlled" moderation, which is terrible for free discussion because people censor each other.
- Probably very limited mod tools. It's probably worse than Stack Exchange, and Stack Exchange is pretty bad -- I see spam there all the time. Can Discourse split threads, merge them, send PMs for deleted posts, automatically ban proxies, smartly detect spam text, subject new/suspicious users to additional proof-of-work to prevent spam, have self-moderated topics, nuke users with automatic smart IP bans, track all of a user's IPs with proxy detection, etc.?
- Doesn't seem to support OpenID.
- No polls
- Limited user stats, etc.
- Can't ignore users.
- Can't ignore categories.
- No categories that only some users can see (?)
- Doesn't print nicely.
I'm not going to use Discourse.
So your poll is lacking two important options:
1) it's already been done and they said they don't want us
2) Theymos thinks discourse sucks