I must take argument to this, since wrath the game has become locked to a single tier at any one point model (which is what I believe the OP is getting at), and with badges and points it hasn't budged since then. And that killed it for a lot of us. Since wrath blizzard has just added more of the same style content (although I admit challenge modes look reasonably meaty) and haven't pushed the game in any direction at all.