From: Secret Underground Lair
Not sure this is what the OP intended but, to me the question of "going back to" implies that (a) you play it intensively, to the point that you get sick of it just from playing it too much (not because of a flaw in the game); then (b) you go back and replay it again; and (c) B might recur multiple times. As an exception to this "go back to" pattern, I would point out two games that are "never go back" games to me: Call of Juarez 2; Gothic 2 (or was it 3?). Both superficially good games with real promise, but not only did I not get in to them for various reasons, and never "finish" them, but I have no desire to ever fire up the game again; if I could lose the ability to ever play them again, and get even $5 I would happily do so.
The ones I have "gone back to" the most times over the years (not that I necesarily have gone back to them lately, nor that I will go back again [even a good thing can be done too much]):
Sid Meier's Pirates! (must have binged on that one till I puked at least half-dozen times during a seven or eight year span, I "won" at least 3 times [meaning entire Caribbean taken over])
Hired Guns: The Jagged Edge (have gone back to it twice now and have yet to beat it; maybe third try is a charm?)
Crown of Glory Emperor's Edition (have gone back to it at least 3 times, and yet to "beat it" [in this case that would mean something like conquer all other Great Powers])
Civilization 3 Conquests (probably more hours of my life spent on this game than all others combined. SOO many mods, so well balanced, such a nice compromise between graphics and game play. Will probably never play it again, but I definitely got my money's worth)
Oblivion. Only bought it this summer, and played it exclusively, for literally hundreds or hours. To the point where I lost interest. But I'm sure I will go back. I've only begun to scratch the surface on mods with that one.
Railroad Tycoon 3 (might've been 2, anyway, the last one in the series; revisited it many, many times. Might even reinstall it one of these days . . .)
ADDIT: couple others I forgot:
Microsoft Flight Simulator X Deluxe
< Message edited by Anthropoid -- 12/2/2010 8:48:58 PM >