There are a few threads about this already. The gist is that this forums software is steaming pile.
- People are frequently unable to register.
- The forum inexplicable bans users for no reason.
- Spam controls are non-existant.
- Can't ban users because the update query causes table locks on tables causing the entire site to freeze up and give 50x errors.
- The code base is a mish mash of crap. Mods are not plugins, they are modifications to the code base of the forum. This makes things VERY fragile.
Vanilla Forums is a Web 2.0 refresh to the idea of the forum. It keeps everything you need, removes the rest, and gives more integration with social networks.
Why can't we fix this site and stay here? Sorry, I seem to be confused as to why it is you want to move.