I agree, I also miss the ability to jump, say into the ocean and just look around. I miss stuff like the underwater base in DE. It was one of my fav, and made a great change from the sneak through a room with 5 enemies in it.
I found this game to be somewhat harder, and that is good. Half way into the first you could be a god, walking through every situaton.
Arent Eidos making another Thief game as we speak? Im sure theyll make another DE. I hope they pull it off as making a game with all these themes takes time and cant be rushed. And Im not sure if AJ could work as a main char again?
Oh, and I also enjoyed IW. It had a good story with depht, but it didnt have that DE vibe and was dumbed down, same ammo for all guns, and small maps/missions messed a good story up. I just love one of the endings in IW. If you like DE, then IW can be played for the cool world and its sad tone. Not often mentioned, but you do more choices depending on what factions you like in IW. I think a faction system would have worked well in HR as well.