I used to play a now-defunct MMORTS back in the day with Warcraft3-looking graphics: Ballerium (https://www.youtube.com/watch?v=WgIk8HQPnP4).

Shattered Galaxy is also MMORTS and is still alive: https://www.youtube.com/watch?v=HBY-WGFQk98

Really hard game concept to get right, though. Something that was cool about Ballerium was that it was one big open world. I think Shattered Galaxy was a lot more instanced, but I didn't play it much.

Definitely room for more exploration in the space.

I played in the Shattered Galaxy beta and it was a fantastic game. I haven't thought about that game in a long time. Glad to see it's still running.

I also played this game.

http://www.sgalaxy.com/