This game still maintains elements from the first Dungeon Siege, but overall the gameplay is a lot different to the first.
The second installment is slightly harder than the first, with the easiest difficulty a lot harder (I think) than the easy difficulty on the first. This makes the differences from the first quite substantial meaning that real hardcore fans of the first may not enjoy this game.
Yes it copies Diablo, but once again this smashes it hands down as like the first, you can feel you have a purpose for playing it. For new players to the game, im sure that Dungeon Siege II will prove quite popular. In addition to this, Dungeon Siege II has extremely nice graphics for a game of 2005.