It's a very rewarding experience and a good way to procrastinate working on your backlog. In the half hour that this took me, I could have been working on Assassin's Creed.
k I sorta did mine Spoiler: beat Spoiler: not beat and the rest I'm not sure about or you can't beat, and most of them are also uninstalled.
Not bad, but you should at least categorize your uninstalled games that you can. It's a daunting task when you've been through multiple Steam sales and Humble Bundles, but it's totally worth it.
I did that too at first, but it got annoying to not know exactly what I had, so I split everything that I needed to into alphabetical categories.