Before this gen it was less than 10%. But now I've got disposable income and that damned Virtual Console, so it's propably more than half now.

I usually finish all my games story modes and the like and i only really try get 100% on games that really appeal to me

I usually finish most of my games soon after i get them (unless they're RPGs and massive adventure games). However, I do tend to have times when I buy multiple games and don't finish one of them as the other is just too damn good! About 15% of my games are left uncompleted.

Less than 10%. Once the credits roll, it's game over and I'm on to the next one.

I need something in the less than 1% range. I buy wisely and almost always finish games I buy. Occasionally I've gritted my teeth to finish something to feel justified in critiquing it - for example I came close to abandoning Assassin's Creed when I realized early in that they literally hadn't had time/money to actually finish the game.

I have a PS2 disck wich has like +300 Super Nintendo Games. Does it counts? If it does, I'm screwed.

most of them
:(

Very few, around 10%: Amongst the several tens games I own, I stopped playing Silver because despite nice it was so buggy to always crash, I couldn't get Shogo to run acceptably due to graphics card incompatibility, I stopped Myth III because it was utter crap and an unacceptable insult to Myth I and II, I couldn't install a gift copy of Ultima Online due to audio incompatibility. Them apart, I suspended playing Planescape: Torment, Temple of Elemental Evil, Thief III and Morrowind for various reasons, but I plan to catch up and finish them all, except perhaps ToEE (I must patch Thief III to run on my dual core though, and most probably I'll have to do the same to GPL, as it crashes quite often, and it didn't on my previous single core). I have some games I still have to start, when I have time.

Had you asked me 3 years ago, I would have said 95 %.

Had you asked me 1 year ago, I would have said 70%.

Today, about 40%. I started buying less games, untill I finished the old ones.

Only one PS3 game I haven't beat. (Ninja Gaiden Sigma)

Majority are on the PS2

I'm under 10%.

If I buy a game, I will always try to finish it and if it seems to be easy to platnium, I continue on and platnium it.

But there's one game from my entire game library that I have not finished and that's Borderlands.

Other than that I've finished them all.