If you are one of the few who enjoys the idea of an open ended game like Elder Scrolls IV: Oblivion, but ultimatly find it as engaging as Stephen Hawking's "A Brief History of Time" then The Witcher is your kind of game.
You can grab a free copy of The Witcher Enhanced Edition for a limited time.
They should enhance it again to get rid of the many many remaining bugs and add gamepad support.
Nod your head to this earworm, oh player of CD.
Steam's Summer Sale has tons of games at low prices, but here are the best games you can buy without worrying about spending too much money.