Arcanum is a real masterpiece between computer Rpg. It's very similar to Fallout in structure (and also at the End), but the other reference for this game is Planescape Torment. Plot and quests are deep. Nothing is like it appears. At the end even the good characters will be tempted to follow the "evil" enemy. Is It's buggy, Fallout and Torment are better from a tecnical point of view. But the game has a special narration and a very original background.
A rpg like no others.