GTA 5..

I play GTA V at the Playstation 4 (not my own one). It's a great game, as it's updating and changing regulary. (For example the "snow" update a couple of weeks ago).
It's pretty fun. In a group you can do so much stuff as in there's nothing really "impossible" in GTA.
And if you're alone, just jump right in your tank and blow some chopper down.