A few new ones to add:
8. Amnesia: The Dark Descent - I really don't have good composure for horror games, but I felt like this one managed to improve it (like training!) I was able to withstand longer and longer sessions without quitting. I loved the lite puzzles in the game, though I did have to peek at a walkthrough twice. Once in the study where you have to break a window, and again when you have to fix that machine by accessing a trap door on the ceiling.
9. Edna & Harvey: Harvey's New Eyes - Been avoiding Daedalic stuff for a while, can't remember why. I loved the writing in this one though, and I was happy to see a point and click adventure game with "mini-games"
10. Lego Marvel Super Heroes - I was impressed with myself on this one. I decided I was finished with the game at 60% instead of 100%. The main scenario only accounts for about 15-20% of the game, so I still played around afterward for quite a while. I've realized this has been my downfall over the past few years.
With my PS2 games I would just play through a game normally and finish it, then move on to the next one. When I ran out of things to play, I would play through a game I really liked again to try and get everything. There are still games on the PS2 that I'd love to go back to and get 100%, but I don't consider those part of my backlog.
Meanwhile, I've suddenly become obsessed with finishing everything with absolute completion, and that's a big part of the reason why I have so many games I haven't even touched.