Last game I played on Hard was R&C CiT, the only thing I had trouble with was I kept running out of ammo but I always had my trusty wrench. All the challenges were the same regardless of difficulty so the only thing that was different was the enemies did more damage and had more health. It didn't help the weapons weren't nearly as good as on 3.

The only game I ever had trouble with was DA on normal. Seriously I'm sure I was doing something wrong but I figured it was similar to FFXII but I got my ass handed to me so much. On easy it's a completely different story but I can't be bothered going through it now.