This game was such a disappointment. Repetitive, predictable, frustrating (from a technical standpoint), it felt like that kid who could've gone to MIT, but instead, turned into a burn-out who got fired from the video store.
I don't understand why this game was made. There are other games that do stealth, free-running, and theft so much better, namely, Fallout series, Skyrim, Mirror's Edge, Assassin's Creeds, etc, etc, etc. Sometimes a series runs its course, and Thief should have been allowed to die gracefully. Unfortunately its swan song will be this atrocity.
This is a game that should be completely open ended. You're confined to small areas that really don't have much to offer. The game is divided into 7 chapters that take place in different parts of the city. Some of the chapters just seem needlessly long but if they weren't the game would be way short.
Most of the game relies on stealth and either avoiding your enemies or knocking them out. The guards always attack you if they see you. It would have be better if they left you alone unless they actually see you committing a crime. You can pickpocket people for money or knock them out and take it. Nobody carries a lot of money with them however.
Robbing buildings for loot gets tedious and MOST of the items you steal have a gold range from 3-15, some are more but scarce. This wouldn't be an issue except most of the upgrades cost hundreds if not thousands of gold so it takes FOREVER to buy them just from loot gathering. It forces you to complete the "Thiefs Challenges" during each chapter which awards you more gold but can be a complete bother to achieve. There are also a few side quests.
You can't freely jump, only at certain locations when prompted. Fighting is nearly pointless as the only weapons you have are a blackjack and a bow. You don't get a sword or any other weapons despite defeating enemies that carry them.
The dialog is very repetitive and generic, the NPCs say the same things over and over. The character models are also generic and uncreative.
Instead of passive abilities, most require the use of Focus. Which wouldn't be a problem if it regenerated but it doesn't you have to use items to replenish it. And the focus drains pretty quickly.
Finding destinations can be a hassle as there is rarely a direct route to get there. You often have to travel some convoluted route to get there.