So far what have you bought during the Steam Summer Sale? I bought Dishonored, Half-life 1&2, Portal 1&2, Team Fortress, Deus Ex, Arma II, Fallout New Vegas complete package, and Saints Row the Third.
Chivalry, Dark Soul, Deus Ex: HR, Dragonborn DLC for Skyrim, Fallout New Vegas, Half Life 2, HL2 Episode 1, The Last Remnant, Magicka, Terraria, and Torchlight 2. Was worth it. I don't think I regret any purchases, although I must admit that Dark Soul is a horrible PC port. Still, I'm getting used to the awkward controls, so I'm getting around...slowly. It's not enough already that the game is quite difficult and unforgiving, but the controls certainly adds another layer of ... complexity.
I know, but I don't see the point of going out to buy a controller for a single game that will cost me more than the game itself.
Not if you already own an Xbox 360 like I don't! But yea, or you could get a third party gamepad for the PC. They tend to be cheaper.
I bought Civ V Gods and Kings, Awesomenauts, FTL, Fallout New Vegas: Dead Money, and Fallout 3: Game of the Year Edition