I give up!
Some games just don´t live up to the hype. Some trail off and you lose interest. Some are just too gimmicky to last and some just gets too tough for me to bother completing because while I enjoy a challenge I do not enjoy being punished for playing video games... especially not when it is the game itself punishing me. Some, on the other hand are good enough games that just arrive at a bad time with too much other stuff to play.
This list is ongoing as I add more titles when I decide to abandon them. I might pull them back out at some point but chances are slim, with all the new games coming out all the time.