I was just playing Total Annihilation last night! It's kind of amazing coming back to this game after so many years. A lot of the aspect of the game actually aged really well. I was able to bump up the resolution to fit a modern wide screen monitor using a few registry changes. The game still looks great and on a modern CPU it absolutely flies even with 1,500 units per player.

The scale of the game has never been replicated by any other game/series as far as I know. There is so little micromanagement. It's almost half economy planning and half strategy. Once you have enough energy production and MOHO metal makers, the economy can basically scale infinitely. I basically just queue up my factories with the different unit types and automate their orders to patrol certain areas and watch the mini-map to see how the front line is shifting.