That's great, but you failed to mention the true potential of Glest: it's mods. With them, there's a lot more than just the two factions, two tilesets, and eight maps. I alone count 27 factions, 21 tilesets, and 88 maps alone, and I can't claim to download every Glest mod.
As well, the original Glest game is dead. All development is on GAE and MegaGlest. Perhaps you should review GAE instead? And try some of the mods, such as Military, the MegaPack, or Project Green?