CDDA, takes awhile to get comfortable with the controls, but it does scratch a certain itch once one can get setup and start to test one's luck in search of the good stuff.
One has to make their own objectives for it though otherwise one can sort of just get to a point and not know what to do. But getting to a point where you can just walk into a city and be the most dangerous thing there does have a certain charm to it considering the journey getting there. It certainly rewards exploring though as one can find all sorts of craziness hidden away waiting to be found.