Not worth 400 gamer points!
1) The platforming is poor. They spend energy convincing you she knows how to climb and yet it is a skill that is used only infrequently and only as the developers want you to, not as you wish to try.
2) Manipulation of the environment is limited. The platforming would be better if you could climb on everything that looks climbable in the environment.
3) Lag -- The delay between reaching an interactive point and the response is too slow. Just try hacking a console more than once (something I had to do frequently) and look at the delay between exiting a hack and being allowed to start it again.
4) Broken mechanics. Using the mavi on the cameras and all available cameras are not shown. This is a real problem when the requirement is to use the camera to find and unlock a door before you drown; particularly when combined with the fact that you can't just swim to the door and open it yourself as that wasn't "the goal".
5) The story line builds interestingly and then leaves you hanging with no payback for the time spent putting up with the above annoyances.
6) Poor battle mechanics -- leaping over cover when I pressed B to take cover? See comments about lag.
In short, save your money and spend it on something more interesting.