I know games against the AI aren't really a big deal to some, but I think I'd get killed online, so that's how I play.
Moderate was getting super easy for my friends and I, so we had a challenge to see how we'd each fare against a hard this weekend.
Here's my first try: I won.
Now, as Hades, I'm normally not a defensive player (I normally don't even build walls at all), but then I read that Hades is more defensive because of the walls and towers boosts, so I tried that. It worked out well. I ended up having to build a titan because (knowing from experience when my friend and I played a hard 2 on 1), hards are like one of those birthday candles that just come back on once you blow them out.
Last thing: I probably shouldn't have gone up against an egyptian, because they spammed slingers and made my Hades-boosted archers useless. Oh well.