I'm here to complain about the 35% off code too, because at least here I know a lot of people will read it. I made what I thought to be a very compelling argument in their forums for how GMG handled the 35% off debacle, hoping that they would at least acknowledge their bad behavior. I even said something on their Facebook post about it, but they have not responded with one word addressing it. That means they don't care about their reputation or their customers. Honestly, it's now just about the principle of the thing, not just revoking a promised 35% discount. When a company like Steam screws up, at least they stick to their end of the bargain.
I took the survey when I got the email. At the end of the survey you got your code and it stated Jan 1, 2013 as the expiration. The email they sent later was titled "Thanks for the feedback, here's 35% off!" Now, if you already know it's going to be valid until 1/1/13 and you get a confirmation email titled like that, who is going to read through the email and just notice that the date was changed? It's purposeful misdirection and they need to fess up to it and reissue a new 35% off code to the people who did the survey but didn't get to use the code as promised. How about an email to all of the survey takers titled, "Xmas Survey change of expiration!". That gets my attention!
Here's the simple break down.
1) Offer survey via email with a reward for spending the time to do it.
2) Offer the code to everyone else on the planet at the same time for no work.
3) Get massive attention from the deal as expected.
4) Change the terms of the deal with little warning to make sure people wouldn't cash in their 35% code.
5) Ignore all negative response until the smoke clears.
Funny thing is they put up a new 25% off voucher today, but the game I want is no longer on sale. Surprise surprise.
They definitely are trying to screw you over specifically. I would recommend pursuing legal action against them for these dishonorable acts.
So I get why people are upset about the voucher date changing, it sucks, they didn't make it clear, etc. I was waiting to use it, I didn't find anything to use it on prior to it expiring.
I also know that just like today's 25% code, GMG is going to have another code up and another and there will be another game they will have the best price on and I will use them again. No need to beat this thing into the ground. If this is such a huge deal that you won't use them again then don't. Send them a snarky email and be on your way with it.