I treat Scoble's view of Wave with the same reverence I'd apply to his views on TokyoTyrant. He's not an opinion-leader on this one as far I'm concerned.
I've been playing with it, and I think I agree with him on most points -- it is awfully difficult to follow a conversation, and I'm not sure whether I'm going to be able to find a use for it once the initial "Hey folks, my wave invite finally came through!" conversations die down.