This game is timeless. If there is one game that I keep going back to for replay value its Borderlands 2.
Gameplay is superb, the characters are memorable, the story lines and humor are just plain silly, and the fun factor is 10/10. I really love the art style as it doesn't try to take itself too seriously.

Each factor of the game comes together to make one nice package that I'll probably never grow tired of even if I hit 2,000 hours.