I'm not sure as to how criminal it is to download CivI on the net. After all, it is no longer available from most shops, and the only way to get it might actually be to get from the web. There's a concept called Abandonware, and many great sites supporting this offers you free of charge download of many old games, including such classics as CivI and Colonization etc. -I'm sure Sid won't object -he already made a fortune from Civ2 and is going to collect again with CivIII.
As for CivI, I think one of the truly great things about it is -as well as the wonderful, crisp and clear 2D map, the crispy, naive, pixeled graphics-, are the foreign leader pictures, with Ghandi or Stalin landing riflemen and armor on your coasts, saying with a foney grin : "We have decided to rid the world of you Civilization! Prepare for war!"
Newspaper jokes like "The weather forecast. Rain, rain, rain. Noah predicts." makes things even more hilarious!
The game have much satirical -political- charm, and it adds to a very simple, but very intriguing gameplay, that really makes you stay playing it. The diplomacy is much simpler. One thing that is missing, though, is for player initiatives to diplomacy. It is always the AI that make you an offer you can't refuse, not the other way around.
-One really annoying thing with Civ2 is all the clicking thru different screens just to get started. With CivI, just 2-3 clicks or so, and you're in. The game pace feels a lot faster with CivI. -this doesn't mean that a game can't last till early in the morning!
I agree with most of what's been said here, and I really do like the customizability of Civ2 with scenarios etc. -I was kind of very disappointed when I first saw CivII. The units, the graphics, too many opportunities. The game is not quite as focused. This is good as you can customize things more, but bad for sheer accessability and enjoyment.
CivI will always be a classic!
Yours Truly,
Morten