Have you ever won a GA that you regretted entering?

Nope

No way :D

Fortix. I won so I can't win Fortix anymore. D:

Never.

Yes, I won the Foreign Legion: Multi Masssacre game, I played it, I did not like it, I do not even know why I entered it, I only enter for games I want, though it was near when I joined SteamGifts, I regret it and its the only GA I won, I won out of 1043 entries, they are the real winners :(

Ace of Spades, tought it would be a fun game... Bow how wrong I was...

I won starvoid over a year ago, the most people I ever saw in game at once was 3. That was a waste.

I won Bad Rats: the Rats' Revenge....

no... game its free and points are free .. why regret ?

"Artemis Spaceship Bridge Simulator"
It's something I would love to play with my close friends, but they arent really into PC gaming so it hasn't got much use at all since I won it.

Not really. Because I enter only those I want to play.

2 visual novels.

Yes.... i keep entering games i dont want, to win them and i dont know why i do it and the regret i feel before even winning them, hurts...

Not really. I won "only" two games: Guns of Icarus Online, I played it like 4 or 5 hours, not bad; and Alan Wake's American Nightmare that I didn't like very much but I don't really regret the time spent with it.

this one

Serious Sam: The Random Encounter, a giveaway by igotelbows, im happy that he bugged or smth like that and couldn't give it :D

Never. I don't enter giveaways for games I don't plan to play because otherwise I feel that im stealing the chances to win from people that actually want the game.

I regret nothing!
Well, I won Death Track: Ressurection, which turned out to be quite bad and nothing remotely like the old Death Track game. But at least I got to try it for free when it doesn't have a demo ;)
(I might give away a copy if someone decides to host an event for bad game giveaways though...)

Giana Sisters: Twisted Dreams.
Because I know that some people want it, and I don't like it because the controls are awful. :x
(Not that I am not thankful, just to make it clear.)