as a huge fan of the previous game in the series, i'm really looking forward to this one.
Basically it just played and looked bad overall. It's been a shaky project from the get-go back in 2009, with key members of development staff leaving. The latest delay (the game was supposed to be out by now) is supposedly due to Eidos wanting it to be out on Xbox One and PS4, but from what I've heard, that's just a convenient excuse.
Reviews are starting to hit and as expected, the game seems kinda bland/bad: http://www.polygon.com/2014/2/24/5441360/thief-review
... and one more: http://kotaku.com/thief-the-kotaku-review-1529393950