I rented this game this weekend. All I can say is that it rocks my world. It's like Tomb Raider (but with all the design mistakes corrected) and Ico (without the creepiness). The only thing that annoys me is that its got save points. Even so, they're spaced pretty much right where I would expect to save anyway.
Games like Tomb Raider and even Mario64 and Mario Sunshine owe a lot to Prince of Persia's original 2d incarnation. This 3d incarnation of the franchise is about as perfect as someone could want from a the genre: acrobatics, over the top brawling, platform and jumping puzzles, timed craziness and gorgeous visuals and audio. The presentation of the whole game is especially excellent. The designers have let the Prince tell his tale to you. After you save, he'll say things like, "Alright. I'll start my tale from here next time," or when he dies and the game prompts you to reload, "Wait, that's not what happened. I didn't fall off that cliff. Let me start again..." The voice acting is top notch.
The story centers around a young Prince, whose father has been convinced to sack a city and steal its treasure by a traitorous vizier. The Prince decides to make a name for himself by being the first to reach this legendary treasure hoard. He ends up stealing a magical dagger, and is tricked by the vizier into unleashing the Sands of Time. The Sands turn everything into a nightmarish reflection of itself. As the Prince, you must collect all the Sands and return them to the Hourglass from whence they came.
Imagine a Tomb Raider game that actually looks good, and instead of guns you have a sword and a dagger. There's lots of crazy brawling with incredible acrobatics. You can run along or even straight up a wall for a certain distance, and swing off of trapeze bars and stuff. With the dagger you can reverse time (so if you fall off a cliff or something, you just reverse time to right before you fell) or slow it down (think Force Speed). If you stab an enemy with the dagger during combat, it is slowed down, putting you at an advantage.