I'm currently still playing through the new Thief game, but so far, I have been having fun with it. That said, I will admit straight up that a lot of Yahtzee's criticisms are both valid and correct. The levels do feel significantly smaller, there are irritating-as-hell points of no return, the main antagonist is a cardboard cutout with a Snidely Whiplash mustache glued to it and contextual button prompts fly up all over the place like mosquitoes in the southern U.S. in the summer.
As to "New Garrett's" personality, I haven't quite gotten the "Brooding Batman" vibe from him just yet, but I can see where some people might get that feeling. The takedown animations do create a slight feeling of disconnect between the player and the act of knocking out a guard, but I find it tolerable. Although personally I'm irritated by the way the game gauges your play style, labeling you a predator, ghost or opportunist. I'm really hoping the game doesn't create multiple endings that are akin to a good/neutral/bad ending depending on how many times you get spotted, how many guards you knock out or how much you steal.
Overall, I'm certainly going to play this new Thief through to the end and probably have fun in the process. But there's no doubt this game is divergent from the original trilogy and not often in a good way. Overall if I could, I'd tell Eidos Montreal "It's a pretty good effort, but next time, try to stick to the original source material more instead of making Dishonored crossed with Deus Ex: Human Revolution." (And I don't care what people say, DEHR was not that great a game.)