In my opinion, behind the focus on DRM-free, GOG is best known around the internet for "old games that work on new systems". And TET has said that's what their focus is, games that just plain work or work right "out of the box". (I don't know if there's been any attempt to "downplay" that or not, but I am a little sad that it doesn't have it's own "number", maybe #3 instead of "Extra bonus goodies". It does fall under Extra Compatibility, though, under #4,"Games sold on GOG.com are compatible with Windows XP or later and select titles also work on Mac OS X 10.6.8 or later.")
Looking around the game specific forums gives a bit of a negative sense as to how GOG is doing on that front, but naturally people whose games work fine won't be posting there. So here I'm hoping to get a sense of how GOG is actually doing on the "games that work 'right out of the box'" front, no matter how ugly they may look without fan patches or whatever. It'd be nice to get a fraction or percent amount, like "300/310 games have worked without problems" or "~90% of my games have worked out trouble", but feel free to provide any info.
I'm hoping that most of what I hear is positive (while keeping in mind what TET said in "The Silver case" thread) because honestly, I believe it's part of what we're paying for. As somebody who was p.o.'d at the Dungeon Keeper 2 situation said, we could easily pirate these games and tinker to get them to work ourselves, but we're paying GOG for tweaking, testing, and compatibility assurance.
(Certainly props to the team - mainly timeslip - for the DK2 patch, though. Perhaps they get frustrated because we don't see what they put up with behind the scenes, like with Anachronox.)
For me personally, I have about 30 games (including freebies) and the only one I think I've played that I have had a problem with is Beyond Good and Evil, but I fixed that by setting the resolution to 640x480. (My current graphics card seems to be a piece of crap anyway, nVidia 7600 GT)