Schimid introduced me to this site. You just list all your games and then tell it which you've not beaten, which you have, which you've gotten 100% completion on, and which you've MAAAASTERED.
He uses it as a way to prevent himself from buying new games, and I'm using it to measure my e-penis.
As you can see.
Anyway, post your collections and beaten ratios. I was amazed to discover that I've actually beaten about half of my games.