Not very rewarding.
The battles were pretty fun.
But on easy mode, all you had to do was make all your men stand in one place, wait for the enemy to come, and your army kills them all as they're coming. That's a guaranteed win every time, so the battles got boring pretty quickly. Anything harder than "easy level," and you will surely lose every single battle you fight, no matter how many men you have. The battles could have had more men on them as well, and the computer's forces sometimes had elephants! Hey... I want to control elephants!!! But the game won't let me - that's only for the computer. It's no use negotiating with other countries because they will all want to go to war immediately. Once you win, you don't unlock anything, and nothing happens. Game over, man!
The Bottom Line
You can play something better in your spare time.