No, they are not a rival site at all. In fact this afternoon I spent a good while talking to Furious, one of the admins over there, and extended him an invitation to come over here and join. We're maintaining a level of civility between the sites, but we obviously have an ambition to be more successful.
But I agree... I have 3,500-something posts over there. I love that place, but recently I've just noticed some things I think we could do better. We'll see what happens.