There are loads of games out there and in this respect, lots to complete. Often it's easy to buy a game, get distracted and find that you've never really gone back to it.
We'd like to know if you find yourself in this situation. Have you bought a game only to play halfway through then find it on the shelf? What is your reason for not completing games? Is it because you don't enjoy a particular title or because a game which interests you more comes along?