I'm not a big fan of Runescape. The quests are dull, the majority of the world is kept away from players who play the free version, and the point-and-click movement in RPGs is not my cup of tea. However, what I do love about Runescape is the item crafting, that is, smithing, mining, cooking, etc. You could make your own weapons and armor using resources you gathered from the world around you. I always loved that, as it makes me feel more immersed in the world. I always wanted an RPG that does that sort of thing, where you could take a break from any quests you have and make your own weapons and armor to sell, or improve your weapons and armor for more attack and defense. And Skyrim really delivers that sense of immersion. While you can't do as much as in Runescape (like, you can't go fishing, afaik, and you can't chop down any tree you see for firewood), it is a great start. You can find ore deposits in caves or mines, and, with a pickax in your inventory, mine them for ores, or a woodcutting stump, and with a woodcutter's ax, chop up wood. You can even make your own potions, which, while it is something Oblivion had, it's improved on, and it's easier to level up your alchemy skill just by making random potions until you've gotten enough perks to get serious about what you want to make for your journeys. And the enchantment is massively improved from Oblivion. In Oblivion, you had to go into an Oblivion gate and fight your way through the residents of that little piece of Oblivion in order to get a stone just for the purpose of enchanting, and it was never guaranteed what enchantment you would get from the sigil stone until you pick it up, meaning you'd have to go through yet another gate if the stone you got was not what you wanted. Not here. Here, all you have to do is take an already enchanted item, disenchant it (Best to use an item you never planned on using) to learn its enchantment, then when you want to use that enchantment on another item, select it from a list of enchantments you know. As long as you have the item you want and a decent Soul Gem (or Azura's/Black Star), and the enchantment is compatible with that item, you're free to make the item give whatever effect you want without having to go back and get another item that gives that effect.

So, yeah, the item crafting feature is something I find similar to the one thing I loved in Runescape, and this is just one of the things I love in Skyrim itself.

The best part about it IMO is that you feel like part of the world. If you see people eating a stew, you know you can make it by hunting the right animals, getting some salt and cooking it. If you see a weapon, you know you can make it too from raw materials.