I have to say more? Well, I'm very particular about what I even decide to play, so it's rare for me to not play through a game nowadays. Still, if I end up not liking it for some reason, or simply get bored, I will drop it, and move on to something else. I'll feel somewhat guilty for a day or two, and tell myself that I'll get back to it, but I know I won't.
Life's too short to play games that aren't amazing me.