I think the site should put on here the Elder Scrolls 3 Morrorwind (It isn't old but still), the original Diablo and Diablo 2, and Stronghold 2. Any other games?

Go read the FAQ...
...have you read it? Good. Welcome to the community :-)

goddamn diablo is over priced, and you'll never see it on here, you know why?
the blizzard store.

If only Blizz would come to their senses and offer Warcraft 1, 2+exp (or bne), and Diablo 1 again.... Lost Vikings and the other old games would be a nice touch as well, from their own store or from here doesn't really matter much to me (other DD services? well, this one and Blizz' own are the only one I use currently).

Blizz's store doesn't seem very DRM-y, but I only own one game from Blizzard anyway.

Ignoring the CD key, I don't actually think there's any DRM in their downloadable games. Of course I could be wrong as I haven't tried installing games downloaded from one account with a key from another, but they seem (rightfully, methinks) most protective of online access through the games, and as far as I can discern that only checks 2 things: serial key and game version (or rather some checksum of the game exe and maybe some other files, which get messed up in the case of the no-cd cracks that floated around before blizz made their own). And yes, I do own all their games released since battle.net launched.

I think you can download warcraft 2 or 3 from fileradar.

I guess we could see Stronghold 2 at some point, but as for the rest; bury your dreams now.