I played Payday during the free weekend a few months ago, and not only was it boring, the physics were weird, the game was buggy and missions were poorly paced. Really didn't enjoy it. I wouldn't pay for it, let alone waste the bandwidth or disk space.
So far: picked up Binding of Isaac, Legend of Grimrock, ARMA II, and Tropico 4 for myself, plus a bunch of stuff for other people. Don't think I will ever play these but whatever