I asked my sister for The Legend of Zelda: Skyward Sword for my birthday. She sent it to me and I knew going in exactly what to except, so that includes the annoying companion and her pathetic attempt at the end to connect with me despite not doing anything to make me care for her because she was so uninteresting the whole time among other reasons, the lack of innovation where they should have innovated, the inability to fully use impressionistic art style to its full potential, etc. as well as the good things like the time shift stones, the more athletic Link, the boss battle mode. I knew it wasn't a masterpiece or even the best Zelda game as so many critics say for every major Zelda release it seems, but that ultimately I would enjoy it.
The thing is I just sort of stopped right before the finish line. I wanted to talk to Thunder Dragon God guy, do boss battle mode, and get the special indestructible shield, so the minute Demise offered me the final battle I ran off in the other direction to do that instead. And, I haven't touched the game since; haven't fought Demise. This is a combination of things. I do need to focus more on college and work and what not. Plus, it is a lot easier for me to turn on my sub-par laptop and play any of my Steam or GOG games than to reconnect my Wii to the TV (My Mom doesn't like me to leave it plugged in), find the one remote that actually can connect as a 1st player (my other 3 remotes refuse to connect unless there is already a 1st player connected for some reason; they didn't do this until somewhat/relatively recently), and put the game in. I just don't feel like it.
Bioshock is another victim of abandonment. 24 hours in, close to the finale, and I just stopped that one too. Haven't touched it in a year.
Bastion I sort of stopped too, but I'm not really sure why except that when I stopped I just wanted to play a different genre to avoid my growing genre fatigue. I really thought I'd go back to it, yet it's been close to 2 months now.
Those are the only games I have truly outright abandoned even though I will eventually go back to beat them. I recently got Devil May Cry 3 and 4, my first experience owning any of the DMC franchise, despite the warnings about the inferiority of the PC versions (though it works well enough and I got used to the control scheme) and beat 3, but didn't do everything. I stopped after a while though I managed to get halfway with Vergil upon unlocking him. I just needed a break. There's only so many times I can replay sections a game pretends to be new by adding some new puzzle or something. There is so much recycling, you might as well be playing entire same missions again sometimes, and having played through multiple difficulties at this point, it just got tiring.