To call Dungeon Siege III a valid entry into the series is a mistake. Sure, it builds on the deep lore which was explored so wonderfully in Dungeon Siege II, but... it just doesn't feel like Dungeon Siege.
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You select a character from a bunch of pre-made individuals, and you're met with design language, an interface, dialogue, and a game that is a cross between Alpha Protocol (except much much worse) and a poorly designed tower defence game, where your character is the tower.
I chose to play Katarina, and it felt like a tower defence game - enemies rush you without really attacking, then I've got to swap between rifle and pistol to ensure that I can kill those very same enemies. If I die, I need to reload my save if my companion doesn't revive me.
It just isn't Dungeon Siege. Poor controls. Poor mechanics. Poor enemy variety.
The only thing the game has got going for it is that it runs on a modern operating system without too much fuss. It has controller support (a clear sign as this was primarily designed for consoles) but that is a complete misnomer, as to have controller support, you'd have to be well, in control.
Whether you're using a controller, or using a mouse and keyboard, you're in for sluggish, non responsive action rpg frustration and an unfulfilling experience. It's like driving a race car all day long, then being put into a tank. The ability to corner is gone. Acceleration is slow. Pain is there, and you feel every bump in the road's surface.
Dungeon Siege III has a lot of bumps in its surface - and nothing can be done to iron them out. Sadly, I was hopeful that this game would capture the control sheme and ... general fun nature of the PSP adaptation, Throne of Agony - but it did not approach that title in any way, shape or form.
I'm sad that the pinnacle of this series remains the game that I once enjoyed - the second. It should've ended there.