So far the only game i've never finished is GTA4. I got it from Steam. I don't know but there's something i really don't like about that game. I liked San Andreas much more. I also got fed up with playing as a bloodthristy and sex-addicted criminal in video games. Glad i only paid ten euros for that. Playing as a chubby plumber eating mushrooms or as an alien cat fighting a sarcastic runt destroying planets here and there is much more entertaining to me.
Another game i've never finished is Mario Party 4... the asses from the local videogame store sold me a broken copy and pretended it was new
- Never went back there. Should try to find a disk-only copy, though.
Aside from these... i think i've finished literally every game i've bought.
There are few games, though, that i thought they were so forgettable made me want to not finish them at all but did anyway. some of these are games of the AC series after Brotherhood. The first AC was pretty linear and never played it again. I played Ezio's trilogy which is the best and didn't bother replaying AC3 and further. Shadow of Mordor also (
because of the frigging Quick Time Event final boss, ridicolous!) I never played Wii Sport and Wii Sport Resort, though: they were bundled with the Wii when i bought it at a very low price. But i've never felt like buying a game if i knew i would never play it. Honestly most AAA games today aren't exciting at all to me. Nintendo games give me that effect.
Still didn't finished Uncharted's trilogy for PS4, but that's because i'm lazy. Since it's Naughty Dog, which has always made quality games, i trust the fact they're good games.
I'd like to see more PS4 games that use a more cartoon style rather than all these grim hyper realistic shooters. But maybe that's more for Xbox.