I'm going to choose games I didnt get yet ( like Dead Space 2 , and the soon to be Bulletstrom)
First Dragon Age 2- Spent hours on the original, and the new one looks even better
Mass Effect 3- Like Dragon age I spent hours on the other 2, and now I can see just how my actions will affect the games ending
Skyrim- I have a feeling this has been listed a lot, so theres no reason to explain why.