One of the finest
This is one of the best games of our generation, and possibly of all time. The game mechanics are smooth, the story is thoroughly original and engrossing, and the settings are absolutely stunning. Very few games have such ambitions – and then match them.
My only complaint would be that the combat is somewhat repetitive and overall a bit easy. But I see this game primarily as a very thoughtful, intelligent, high-concept historical fiction story communicated via the medium of an action/adventure game, so the relative lack of challenge was fine by me.
Also, 12-15 hours is the perfect amount of gameplay time. I know that's short by AAA standards, but the pacing of this game is perfect and I would hate to see it stretched thinner just to bulk up the gameplay time.
I'm not usually a fan of FPSs but this one blows the lid off the genre. Highly recommended.