The above may seem like an odd statement. "But Steam and GOG are two almost completely different companies!" you might say and you'd be right but they still both sell some of the same games and when it comes to old games, GOG is WAY ahead of Steam ...
Let me start from the start: I've bought 35 games on GOG so far. Every single one of those games worked perfectly except for Arx Fatalis which had some speed issues. But hey, it's better than the Steam version which has a ton of other issues! And that's exactly why I made this topic: Steam's quality control is ridiculous to the point of insulting.
I bought Commandos Behind Enemy Lines on Steam expecting the speed issue to be fixed because the original version was simply unplayable in its current state. Instead, I discovered that the Steam version did NOT fix this issue rendering it unplayable for most of the people who bought it. And no, refunds are not possible, and Steam passes the buck to EIDOS instead of taking the game down. Then GOG released it and I was doubting whether I'd risk yet another $10 to see if it was fixed but since I trust GOG a lot more than Steam, I gave it a go and what would you know? FIXED! Perfectly playable!
But the reason for this post is the following: yesterday, Aliens vs Predator was released on Steam. I already owned the Gold version and had patched it to run on Windows 7. It ran fine but you run too fast and half the sound is gone so I bought the Steam version expecting them to have fixed these rather vital issues. I mean, a Predator that runs as fast as the Alien and gunfire which you can't hear ARE deal breakers in a game this hard.
But instead of finding a neatly patched game, I find a cheap cash-in. Multi player is not working, sound is STILL not fixed and you STILL run way too fast. But hey, you got Xbox 360 gamepad support! Except only an idiot would use a gamepad in a game this hard where headshots are vital. Even worse, by adding this support, they bodged "mouse look". It now feels as if your mouse is controlled by a thumbstick with a dead zone - it's terrible! Aiming is impossible!
I guess, when you're used to the top quality GOG delivers, it's easy to get disappointed by companies like Steam that only want to fill their pockets even if the products they sell are second rate. Be ashamed, Steam.

Wow... thanks for the warning. I almost pulled the trigger on that one.

You are right on some points but it is up to devs and publishers. You said AvP for example, Rebellion released that game on Steam. Not Valve or Steam released itself, Rebellion must do the patch or fix the issues before the release or after. BTW I don't have any problems with AvP on Steam, it runs like a charm. For Commandos problem is from Eidos or Pyro, they are selling their broken game on Steam, Steam is just a marketplace not promise to patch or fix games to work on Windows 7 and Vista not the company to fix games on store. But GOG is promising fixing to games on new OS'.
And I love Steam, GOG, Impulse and Gamersgate. I don't like only D2D.

Steam released the game - Steam is a publisher by itself you know. Steam hosts the game, sells the game, patches the game, etc. ergo Steam is the one responsible for what it sells. Before they sell a game, they should make sure it works fine and they rarely do. I've had countless of problems with Steam games because they clearly did not test the game. In this case, all the old problems with the game are still there yet they claim it's updated to run on modern PCs!
And you say you don't have any problems? I say, go visit the Steam forum. I kinda doubt that you don't since the issues are universal ...

WRONG
Steam does not patch the game. Steam just provides the patches.
Do you hold Fileplanet responsible for fixing Crysis?

I just bought AvP on Steam and it runs on my system perfectly with Win7 64bit. Also Rebellion already said they would be patching in the MP at a later point.

Steam is just a store not a publisher, and not promising anything. Devs and publishers have the tools to update their games. They are doing that and Valve is releasing them on Steam. Steam is not responsible for updating the games on store or patching them to work on new OS'. You must know this before hating the Steam.

Don't get me wrong. I avoid a lot of games because Steam lets almost anything on their servers. But it is still the responsibility of the devs and publishers to make sure the game is patched, not Steam.

LOL, it was a great joke and funny. :D +rep.

Steam does absolutely nothing to enforce any form of quality control at all. They wouldn't remove even the most fundamentally broken game from sale.
You have to do your research and given their forum bans people for speaking ill of the Great Steamy One that's sometimes difficult.
That said, there are at least a few GOG titles that weren't play tested before release either.

Erm Steam DOES patch the games - what do you think it means when it says "updating" next to certain games when you start Steam? They just don't make the patches. Just like a publisher does not make the patches either but they DO patch the games.

Nope.

*rolls eyes* Seems it's so hard for some people to use their brains to realise that "to patch" here means to APPLY THE PATCH.
Also: I accidentally edited my original post saying that even if you consider Steam a store (despite the fact they're a publisher as well in the literal sense) they are still, by law, responsible for the content they sell. If I opened a store to sell broken TVs without allowing a refund, it wouldn't be long before I'd get closed down so tell me why Steam can get away with it? It's not the developer that is selling it or having the store - it's up to Steam to see that the content they sell does as it says on the store page.

Funny guy, we want to explain it to you but you don't seem to understand it.

Wow. You actually are managing to alienate GoG's community while bashing Steam. I didn't think it possible :p
A publisher traditionally tends to finance the development team. Steam doesn't do that for anyone.
And let me change my comment:
Do you hold Best Buy responsible for fixing Crysis?
And quick tip: Stores aren't held responsible for broken games.
As for your complaint that it is Steam's job to fix games becuase they "apply the patch"
Do you hold InstallShield responsible for fixing Crysis?