I have a couple of complaints about the new forums.
i) I think it's really poor that links don't forward from the old forums. You now have a load of dead links all over the place, including Google currently.
ii) I really don't like the automatic formatting, I don't like what it does and I don't think it's implemented well. If I write a "b" and then a bracket I get a "", and then if I go and edit this, then try edit something else the caret jumps all over the place.