I bought many games, but 3 of them I asked a refund for.
GRAV - Sucked because it's too much of a grind and time sink. And I think dancing is more retarded than cool. Overall seemed too boring. Asked for refund and got it.
Marauder - Couldn't turn camera because of crazy bugs. High resolutions are not supported. What a shame, could have been an amazing game. Sort of like fallout tactics mixed with STALKER. Asked for refund and got it.
Windward - Nice sailboats game, somewhat fun but the fun quickly wears off when you realize how much grinding you have to do. People suggest to join multiplayer games to speed up the grind, but there is few servers and few people playing overall. Asked for refund and got it.
The Long Dark - Awesome survival game. But way overpriced for what it is IMO. Many disagree. I love it but wish I paid $5 and not $10.
Age of Empires 3, Mythology and Rise of Nations Bundle - Awesome deal at $20
Fallen: A2P Protocol - A mix of Xcom and Fallout. Awesome game. Still in Alpha though.
King's Bounty: Dark Side - Nice, cheap expansion for a nice game
How to Survive - Another nice, cheap game.