Empire Earth is the king of Real Time Strategy games. The game spands through 500,000 years of Human history. You can start your game anywhere within that time period and end it whenever you like. With different technologies and new ways to play in each Epoch(Era), gameplay is unlimited.
Starting in the earliest time periods, you can make primitive military units, and make primitive buildings. As you advance and continue growth, more units become available and more avenues can be used.
Eventually, you can use tanks, infantry, bombers, ships, and many other things that have aspects of World War 1 and World War 2 all the way through to the Nano age of cyborgs and the like.
With campains to relive famous battles and historic wars, and online multiplayer capabilities, you would have to be crazy not to play.
On the other hand, if you're not into Real Time Strategy gaming, this game may not be for your tastes.
Gameplay: The gameplay in Empire Earth has yet to be reckoned with in the Real Time Strategy genre. Empire Earth opens up amazing avenus of gameplay outside the scenarios. You can create your own civilizations and maps.
Replayability in EE is top notch. With such a long time period the game spands and map choices, each time you play, everything can be different.
Interface: The interface in EE isn't the best out there, having to click through two advertisements and a long story video everytime you load the game gets pretty annoying.
Community: There are a few websites which have online EE gaming, where you can face off with other users, and if that's not your thing, you can usually always find friends with the game.
My tilt: I gave the game a 10 on the tilt, because this game pulled me in and wouldn't let me go. It has given me hours of enjoyment, whether it is playing by myself, or with friends, it is one of the best games I've encountered in quite a long time.