Skyrim, Doom, L.A. Noire and Wolfestein in that order.
REASONS:
- Skyrim is a long-lasting and awesome game, you'll know this by now
- Doom adds value in terms of genre (first real FPS and scary game on nS system) and it's a really nice game.. but it won't be longer than Skyrim
- L.A. Noire is a nice game and "open world"; SADLY, the gameplay itself becomes repetitive and dull overtime (the core game of reading people's expressions is awesome but doesn't make up for the repetitive design)
- Wolfestein because it won't be a new genre after Doom.. but it's still a great game nonetheless
if you have the chance, get them all, in that order (y)