I never really liked ORPGs because most of them don't make sense/have a lot of direction.
That said, I do remember a long time ago one map where you were located on these troll-esque islands as a hero of your choice and just went around killing shit. Your camera was set up close to the back of your character rather than a bird's eye view (not first-person though), and you had to kill things for food to keep you from dying.
It had the same save-character system as most ORPGs, but it was the difficulty, organization of heroes, and the very spooky explore/discover aspect of the game that 'kept me addicted. I think it was called something like Tides of Legacy or whatnot, at any rate it was pretty popular for a short while on Battle.Net.