I have lots of admiration and respect for what Brink is doing, and if it turns out to be as fun as it looks I will be extremely happy.
That being said, however, everything in life is a stick of gum in terms of enjoyment --- after a while, the flavor will be chewed out. Happened with WoW and TF2 for me. How long that takes, I cannot say.
But I hope Brink will keep its "flavor" going long.