Originally Posted by blueskirt
And as a result, we don't have a Sierra equivalent of Mixnmojo and LucasForums
I beg to differ. They may not be well populated (although they have seen an increase in visitation as of late!), but the Sierra Forums Gateway
connects a myriad of different Sierra forums together. And various websites act as the main hub for Sierra news for each game series (SpaceQuest.Net, etc). Also, the Mixnmojo forums aren't that well populated either.
Because there are so many different types of games it doesn't really make sense to have one giant one for all of them anyway. The gateway is the closest thing. The Sierra Help Pages more or less acts as the "hub", though, since it's about all of the series.