[quote name='jkimrey']Do these games hold up well, or are they the kind you have fond memories of but when you load them up, not so much?[/QUOTE]
As a massive C&C Fan when i loaded up the 1st C&C it is digitally identical to the original game from when i 1st played it in DOS via CD-Rom. On Origin's web/help site it does reference a third party who provides patches. Given you have to go through the hoops of downloading, patching and testing it can cause a bit frustration. But the 1.06c patch that I ran does fix the animation video problem and does give me 1024x768 vs the original 640x480 or 640x400 resolution.. Again its identical to the original, there was no enhancements made to the game with the exception of maybe you can play this under Windows 7 now. I wish they would put an engine game update to the whole series overall but still nothing.. At a $1 a game its a bit hard to pass this up. To answer I think it held up well but YMMV as per opinion. If you were to play through every game youll see how the engine slowly evolves throughout the series. Again if you play kings quest 1, Space quest 1, etc.. don't expect graphic awesomeness on a high-res system.
Edit: Granted Its going to take a long time to download ALL the games but YMMV on each game also.