Bad Rats: yes
Assetto Corsa: Holy stuff, I have never played a more fun simulator. Absolutely no regrets.
Metro: Last Light: Difficult, but fun. Creeps me out just the right amount.
PAYDAY 2: Very fun, especially with friends. No regrets.
Poker Night 2: Fun, but grows old quickly. I'm at the point where I've heard every line of dialogue.
Games I bought for other people: Don't get me wrong. I love buying games for people, and I love seeing people be happy. I just wish I hadn't bought so many games, because I missed out on some really good deals as a result of having to save money for Assetto Corsa.
This is easily the least I've ever bought from a summer sale. I'm pretty happy with myself in that regard, but I wish I had bought a few other things like Deus Ex: HR Director's Cut or Insurgency.