Haven't heard of it before but curious enough to search in my favourite site, the-underdogs which rates it well enough:
"Overall, I find Dark Colony to be a solid RTS that definitely deserves a second chance. It is not as good as StarCraft or Red Alert, but perhaps comparison with such heavy-hitters is unfair. Dark Colony is a fun, introductory-level RTS that is easy to get into, and provides a lot of long-term play value with dozens of missions-- many more than RTS classics. The graphics are also excellent, if a bit on the violent side, so you may not want to play this game in front of your kids. Try it out, and it may just grow on you the way it grew on me. Thumbs up!"
Unfortunately it's not a free download, so I'll have to forgo the pleasure.