I briefly tried shattered retreat after it dropped, and then hastily retreated myself into an earlier version of the game because I absolutely hated it. (Much praise to PDox, by the way, for having that as an option. If only all other devs would follow their example!)
It's not that I hated the idea, I actually love it as it changes wars from "kill enemy stack dead, then systematically siege down his helpless holdings without a care in the world" to something else. I hated the implementation. Particularly how beating the enemy army, no matter how badly, barely scratched him, leaving you with no choice but to chase him all over creation for a few years.
In my ever so humble opinion, he should at least be neutered for a while as a threat, leaving you with the choice of either chasing him down or ravaging his realm, knowing that if you do so for too long, you might have a problem when it's time to face him again.
But that was a long time ago. Has that changed? Because if it has, then I'm definitely going to give it another go.