A game that was released back in 2001, yet still has people going back to play (in fact, there is still a small but active MP community which still plays this game!)
That alone says how good of an RTS it is.
In fact, it amazes me that no RTS has been released since that combines what Kohan does (although the Dawn of War series comes close, it was a lot more about micromanaging battes and how fast you can click to activate special abilities).
- city management, and the cities generate all your resources
- company based combat structure, where companies can heal back to full health over time (as long as even 1 unit survives and returns to your bases).
- companies and heroes both level up and become more powerful and stronger
- once units enter combat, you not longer have control of the unit (barring retreat and rout). This severely reduces the effect of "microing" (clicking like a madman). It also makes battle tactics like flanking to kill enemy support units much deadlier.
If there's one con to this game, it's that it has a default resolution and doesn't support widescreen (stretches out the images, making them look ugly).