Just check out the Bioware forums for Dragon Age for instance...you will see a Night and Day difference
Different companies handle their PR and community interaction differently. It has nothing to do with the quality of the final game, or which development team is better... its just preference. I've followed gamers where the devs are on the forum almost every day and the game svcked, and other games where you never hear from the devs yet the final game contained a community wish list of features.
If your assuming the developers ignore the forum because they are not active on it, your almost certainly dead wrong. They just don't come here and post for the hell of it, and let the PR department handle info release... thats all.