If you've played Minecraft, as basic as that game is, one thing that's really good about it is how health regeneration is handled. There are no health potions. If you're low on health, you need to actually kill some pigs for meat, go fishing, gather mushrooms or bake cakes. That's something that made that world feel "real", that you actually had to use nature to survive. It was also something that was missing from Oblivion. You just had too many light-weight extremely powerful potions lying around that doing something interesting like hunting deer would serve no practical purpose.