Have you played the originals? Other than Robbing the Cradle and the House of the Widow Moria most of the levels in "Thief: Deadly Shadows" blew chunks. Even the big levels felt tiny and the design, gameplay, and story just doesn't fit with the previous games. The pagan and lost city levels were a joke.
The cradle easily the scariest map i've ever played in a game, but otherwise Thief3 was way below par, it was massively dumbed down for the consoles and the quality of the game suffered because of it.