The Broken Realms story was awesome--until the very end when all of the inter-Order conflict was basically retconned. And some stuff was just ignored completely, like Belakor's cursed skies or whatever.
I like Kragnos in concept, but it should have been the long-running conflict of 3rd ed. A slow-moving, unstoppable god that only cares about the destruction of the realms, and everyone else trying to figure out how to stop him. Maybe the other grand allegiances even broker uneasy alliances to try and halt his progress? Imagine Order trying to broker with Chaos forces to save themselves from the rampage of Destruction.
Anyway, at least we got some sweet models out of a narrative that largely didn't stick around for long.