I think it's good. People are going to have opinions on it, and it's better to have a repository for addressing AA critiques (few are logical enough to deserve being called this) as opposed to having a number of threads elsewhere hijacked with random off-the-wall anti-AA comments (not that this doesn't happen, but I think it would be worse without the AA board).
Even many AA supporters don't think it's perfect; an AA board is a good place to suggest improvements to the current system. I think that the semi-anonymous message board medium is more conducive to genuine discussion than in-person discussion, in which people are almost always afraid to say what they really think.