I recently found a site that reminds me a bit of good reads, but for games. Here you can list the games that you own, and also say if you have finished them or not (and there is also a tool that can randomly pick a game for you in case you don't know what to play).

http://www.backloggery.com/

And if anyone is interested in my very incomplete backlog: http://backloggery.com/fnord  

I hate you, you made me realise that the situation is even far worse than i thought 

i've only listed 20% of my steam list so far and i've got a backlog of 70% unfinished games 

http://backloggery.com/markornikov

I already knew how bad my steam list were, as I only have 3 categories there:
Finished, Multiplayer and the default folder where I have all my unfinished games. I have a similar way of organizing my GOG shelf, so that one was known to me as well. But darn, I have a lot of unplayed/hardly played games.

And I only have 5 games that I consider myslef having mastered

I've got quite a few adventure games i consider mastered because i've played them so many times already ]

Would anyone be interested in turning this into a bit of a game? Basically we will use the random function to pick games for us (with allowed "rerolls" in case you get a game that is either far too time consuming or that you don't like), and see how much you can shrink your backlog in a month or two?

Sounds like a fun game, although we need a few more people to join us... so if you're reading this join us! 

...

I got Kaptain Brawe, certainly not a game that was high on my list, but nice enough to accept the challenge.

I'm going to put a few unfinished on 'null' status because there are a few that i won't ever play again because they're so old or horrible. 

I just got Breath of Death VII.