I installed the now-freeware Enemy Nations (RTS), but I'm having my doubts I'll like it. Yeah it seems to be RTS, but it doesn't apparently have any meaningful campaign, just a skirmish mode where you select the difficulty level of the enemies, and the size of the world.
I dunno... while that isn't different from classic games like Master of Orion or Civilization (they didn't have a campaign either, rather a randomized skirmish mode), I just feel a campaign makes the single-player part of a RTS game more meaningful. Similarly like while playing a FPS deathmatch game against AI bots can be fun, i still prefer playing my single-player FPS games with a proper campaign.
Hence, I also installed Warzone 2100 which I got from DotEmu (I think it was my first DotEmu game, a freebie perhaps?). Now that's more like it! It seems like a proper RTS game with a campaign. I am unsure if the DotEmu version is the fan remake of the game, or the original? I thought it is the original, but then there is at least an ad of the fan remake when you exit the game.