I'm on the fence about Dishonoured. It's got a lot going for it, but it takes quite a few missteps. It's exceedingly easy, it's short, the story is boring and predictable with no effort made whatsoever to create a connection between the player and world, the art style makes everything look a bit muddy and Blink breaks all possible tension and balance out of the gameplay.
It has it's moments though, and it's pretty fun to play. Hopefully when they make the inevitable sequel they'll do a better job with the story, because the world they built is pretty good.