Self-deprecating characters, a slanted story, Secrets and turn-based combat - this with fair degree of difficulty that can be adapted to your own taste.
The game is also very extensive scope - as you play a few weeks off if you want to see the latest secrets and extra quests. In the active community there are questions enough Guides should times get stuck.
What if you have left for RPGs, a Doom and Destiny is sure to please.