Similar to Aminuu's post above, I'd have to say Fallout 4. I played that game so much over the last couple of years and decided to finish it. That game allowed so many side adventures, open world environments... I find that fun.
The last game I beat was The Last of Us onPS3. It was so good, I am considering playing through it again. They have already announced that the sequel is in the works and it looks great. If you have never played this game, I highly recommend it.