I have a stack of about 11 xbox360 games unfinished.
it includes:
Fallout new vegas (expansions downloaded, not done, but main quest finished).
Final Fantasy XIII (got it day it came out, played 2 hours, saving it for that one week where i'm stuck on a desert island)
Red Dead redemption (game decided it didn't like my progress and deleted me back a few missions, havn't picked it up since)
Lost Planet (Am i the only one in the world who found that game incredibly difficult?)
Star Trek Legacy (one mission with timed asteroids always beat me, i even re-started and played through picking different ships, trained myself up a bit, let others try to do it, but nothing)
Oblivion (done the main questline, but without doing the mages guild, it feels incomplete, but i always get kicked from there by glitches).
And quite a few more.
I have games i've never even played on steam (yes i know very bad, but i never find the time).
I have about 100 unfinished PS2 Games, i think the very first game i failed to finish was probly a PS2 title, thats when games wern't a once a year luxury for the first time in my life i think.