A worthy ending to the Sands of Time trilogy.
At the beginning of the game, you probably don't see much of a difference from last years Warrior Within. But you will see that there is enough new substance after you get a few hours into the game. They added just the right amount of new stuff into the game, so it's not 'too' different from it's predecessors. Veteran players of SoT and WW will immediately feel like home and probably won't have any problems with the controls. But also the newcomers won't need more than a half an hour to get use to them.
The graphic engine is old (so it will run on the weaker systems as well), but the game still provides a satisfying amount of detail - the envoirments in general are beautiful and nice to look at. For example, by jumping on the rooftops of Babylon, you'll see your destination, the Tower of Babel, in the horizon. The city itself has a quite 'alive' feel to it when you'll see guards terrorizing people in the back alleys and some rebels fighting against the attackers.
The story... yeah, the story is great and it wraps up all the loose ends and gives answers to all (or at least most) of your questions.
Gamplay is great as always. The new-speed kill system is a nice touch, but you probably won't use it that much later in the game, but that really depends on your play style. Since I'm more a warrior type, I used mostly the free-form fighting system, which is back ofcourse. And I think that this entry has the most platforming action of them all. There are a few new tricks too, like the split jump and dagger plant.
The only thing that troubled me at times, was the camera. Since the PC version is a console port (I assume), controlling the camera with mouse and keyboard wasn't really that good. I know they tell that for the best gaming experience you should use a gamepad, but unfortunately I don't have one. But despite the camera, the PC controls aren't bad at all, since you can map your keys as you wish.
The last few hours of the game were the most exciting ones. Visually, as well as story wise. Final battle gives a good challenge (if you paly at least with the normal difficulty, for the first time) but I also wish there were more boss battles in the game.
In general, Prince of Persia: The Two Thrones is a definite MUST-PLAY for everyone interested in the Prince of Persia games. But if you are new to the series, I would suggest you to play it's predecessors before taking this one, just to understand the story better.