i played it about 50 hours its very awesome
The majority of Human Revolution involves Jensen's quest to unravel that conspiracy through missions spinning off of main city hubs all over the world. While each hub has a central plot thread carrying through Jensen's investigation, side missions populate each locale. These aren't the maligned fetch-quests of other RPGs. Each mission has several layers to it, several angles to be explored or not, several perspectives to consider, and several possible outcomes that often tie into the greater mission at hand in unexpected ways. This creates a well-realized sense of choice and consequence throughout Human Revolution.
The most obvious choices you'll make involve your augmentations. As you play, you'll earn Praxis points, which allow you to unlock and upgrade new abilities. Augmentations are responsible for the biggest differences in moment-to-moment play between one player and another - the wide variety of abilities force you to pick and choose what you want to do. Do you want to hack terminals and discover the hidden secrets of some random guy's apartment? Then you might not be upgrading your sight to see through walls, or jumping ten feet straight up, any time soon.
Eidos Montreal's prequel quickly establishes what the world of Human Revolution allows. There's a vocabulary of play that you'll learn quickly, and once you speak Human Revolution's language, if you can think of a solution, it's probably an option. There's room for stealth, there's room for guns blazing, and there's plenty of middle ground too.