When Blizzard first introduced the idea of the role forums, players were generally unenthusiastic because the original plan was to dissolve the cherished class forums as well. People warmed up to the idea once Blizzard decided to keep the class forums intact while still warning that they would probably devote a lot more developer attention to the role forums. With the addition of a new class, that made sense; being able to give more attention to just 3 forums is a lot more efficient than trying to spread individual replies around 10.
I genuinely like the Tanking forums. Many of the people posting are sincerely helpful, and take the time to answer questions posed by people new to the job and nervous about their performance. There have also been a number of interesting threads sparked by changes to general tanking practices, what tanks hate most, the ongoing debate concerning Blessing of Sanctuary and Druid AoE threat, Warrior viability on a 3D Sartharion, and concerns over Death Knight tanking weapons. The forum is usually a pleasure to read even if a few threads are kind of off-base, and I think the back-and-forth between four different tanking classes serves to take the edge off concerns that players might otherwise have been convinced were unique to their class (which, let's be honest, is probably one of the effects Blizzard wanted).
I don't spend as much time on the Damage Dealing and Healing forums because my main spends most of her time tanking, and things are a little more volatile over there (mostly because of current PvP concerns). Were the role forums ultimately a good idea? Are they -- shall we say -- working as intended?