Dungeon Siege looks and feels wonderful. The scenery is stunning for a game of its era, and the fact that you make your way through forests, deserts, mountains, caves, and dungeons without a single “loading” screen, remains as impressive now as it was when it was first released. In addition, the controls are wonderfully intuitive. When I played Baldur's Gate after this, I often found myself wishing that I could play it in the Dungeon Siege engine.
Comparing it to a classic RPG brings us to the downside of Dungeon Siege: this is no RPG, but a completely mindless hack-‘n’-slash game. The plot is irrelevant, and the (very rare) conversations, far from moving the story along, just disrupt the fighting. The game has the reputation – richly deserved – that if you set the AI on your party appropriately and point them in the right direction, you can go have a cup of tea and come back to find that they've won the game while you were gone.
And now, my guilty secret: I still occasionally install it and play just far enough to get to the truly magnificent moment when you emerge into the snowy alpine landscape of Glacern out of a seemingly endless dungeon. It's bizarre to find one of THE great moments of gaming in a game that is otherwise so lacking in personality.