So I've been playing this for about a week now and I liked it so much that I purchased it. That says a lot right there.
This game has SO MANY negative reviews and I'm not sure why. This is a STEALTH game. If you're looking for Halo or Assassins creed, this isn't it obviously.
This game is about being a thief. The graphics are great and the controller responds to how visible you are. It's great. It's not too simple and there are multiple different strategies that you can take to complete each mission. I personally enjoy pickpocketing people then using the takedown move or kill them. The story isn't that strong, but it is slightly a mystery.
If you enjoy being a thief in skyrim or if you enjoyed splinter cell, this game is for you. It's made by square enix so you already know that it will be at least worth playing.
Follow my advice and give this game a shot. Its slow at first but you'll love it.