95% of the time I finish a game. I've never finished New Vegas because I got bored with it, I didn't finish FFXII or FFXIII because they were both, in my opinion, absolutely dreadful and I didn't finish Red Dead Redemption and then traded it in. Two days ago I bought it again because I realised I was stupid and that game is absolutely brilliant! Those are the only games, of recent memory, that I've never finished
Oh! And KOTOR. I got that game a year ago and have been slowly slogging through it but I just can't get into it. Mass Effect 2 is my favourite game, I also love ME1, DA:O and DA2 and Jade Empire is, again, one of my favourite games ever, so I love new and old Bioware but I just cannot seem to care for KOTOR...
I have a friend who can't play a game for more than two hours before getting bored and trading it in. It pisses me off and we all make fun of him for it