You are describing Dungeon Siege as "deep and detailfull"?!
Wow.. I am speechless.
That's kind of what I was thinking too. DS1's combat was bland as hell. Melee and Range had no options or abilities other than Right Click to Attack. Nature/Combat magic was a bit better in that regard with a wide range of spells but again, combat was simply autoattack. The game was more or less an interactive screensaver. Right Click to Win, indeed. DS2 was a bit better in that regard by adding skill trees and special powers, giving more customization for your characters.
From what the devs have said of DS3, the game will have tons of customization, just done differently from other ARPGs.