Two things to say about AI. The first is that difficulties levels are a little too fluid still. Heroic can be punishing and legendary can feel like normal. It's weird. The second thing, and I have no idea how doable this is, I'd love to see an automatic difficulty return to private games.
No one replied to this thread since February, since the most recently replied/posted threads appear first on Waypoint, you must have scrolled very far to get in there or used an alternate method to access it.