Still enjoying Dragon Age: Origins, but I know I just have scratched the surface in some of the possibilities (such as more strategic options, herbalism, etc.).
Final Fantasy III (NES). I swear that I'm about to quit. This final (hopefully) section is insufferable: neverending mazes because there are mazes inside mazes, oh, and you can't use the Warp spell to go outside. Also, there's this veeeeeeeeeeeeeery long maze, and once I got to the end there was a boss fight impossible to win unless you had leveled up and taken another route at the beginning of the second submaze. It sucks! Since I can't warp outside, I had to undo all the way up to the beginning of the maze.