Truly Terrible Game
Even the early stealth games weren't as tedious as this affair is. While the main character looks nice and I do like the environments, the AI of the enemies is baffling and the game is just another in a long line of the usual "trial and error" gameplay, which is a sign of very broken design. No game should be IMPOSSIBLE to beat on your first playthrough. It should be difficult to do so, but not impossible and this game is impossible.
Taking the role of a British spy who, legitimately, did nothing in real life in the war (she was, sadly, captured and tortured and eventually killed by the Nazis). The game being a somewhat delusional flashback from a woman who is basically in a coma is a clever idea...but an idea doesn't overcome bad gameplay.
I saw lots of well-deserved criticisms of Vampire Rain and I feel the same complaints of Rain fit Assassin as well. If you're caught, you're effectively dead as your knife is near useless and ammo is just a little less common than platinum.
The game is borderline unplayable. I have seldom been this frustrated at a game. I can't recommend the game less than I am. The only game as bad as this is the before mentioned Vampire Rain. Last gen stealth games, even the best one, aren't this bad.