You have to remember that DS was designed for novice players and those put off RPGs by all those stats then everything makes sense.
Perhaps that was the intent, but to be honest, DS is easily out-performed by other games, such as Diablo, designed for the same purpose. Gameplay does not have to be complex in order to be fun, but DS was neither. The first time I realized that you could cast the same two spells over and over again ad infinitum in every battle, I knew that the game was doomed to failure. Even Diablo had you using more than that, and Diablo battles were at least fast-paced enough to keep your attention with the "omg mass slaughter #%#!" even if you were just pressing the same buttons. Plus Diablo had interesting items and spells, whereas Dungeon Siege's spells and items were lackluster and statistical. Save for a few moments of brilliance (the first time I saw the beholder comes to mind), DS was for me mostly forgettable, so you will have to excuse me if I make some memory errors.