I fucking love Dark Souls. What an interesting universe. Praise the sun!
Dark Souls and Spelunky begin with this design premise: watch and learn. If you don't watch, you're punished. If you don't learn, you're punished. But if you do both, you're rewarded with mastery, and Dark Souls bends to mastery. Not only does it bend, it buckles and breaks, respecting the player's ability to learn its rules.
Now this is a good description of Dark Souls!
And yes, when i finished that game for the first time last weed, it felt like i achieved something. Cause i did. I fucking beat Dark Souls.