I play http://www.pressxordie.com/wp-content/uploads/Matrix-Fortress.jpg. It's not the mechanics or graphics, hahaha trust me. I find it to be slow, tedious, and boring as all hell. I want to just experience the story, and I can't do that. A single fight feels like it takes a BAJILLLLLIOOOOOOOOOOOOOOOOONNNNNNNNNNNNNN YYYYYYYYYYYYYYYYEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEAAAAAAAAAAAAAAAAAAAAAAAAARRRRRRRRRRRRRRRRRRSSSSSSSSSSSSSSSSSSSSS!!!!!!!!!!!!!!!!!
Like that. The graphics also have this dull ugly look to them. With Dwarf Fortress I'm either so engaged in my own game plan I don't notice them or have much time or I can imagine something better (I play Dungeon's and Dragons). Fallout's are just detailed enough that I have a harder time imagining my own things, but so ugly on their own that I just want something simpler or some way to get to the plot. I'll even take text. The story isn't so important for me to experience, because it has no more or less reactivity to it than any sort of table top game which I play weekly and GM weekly (so I am the game). My point is, it's just this unsatisfying spot for me.
I love Planescape Torment though, it has such a unique style that it looks like art. I have no idea if Fallout 2 would be the same, I have it just yet to try it out.