well, i have this game boxed, I remember i bought it without trying any demo before, bad idea as usual.
I bought it cause i liked the first Empire Earth (that imo is surely still a lot better even if not perfect, and another game at the end), and as i missed the second chapter i felt it was the time to get something fresh.
Considering i liked the first EE i was a bit disappointed to see this is basically another game, very different under nealry all the aspects, but yes it is an RTS too at least.
One of the most interesting things of EE was the "old style" RTS concept, so building load of structures, big armies, many improvements, collecting resources etc, with quite customizable and big random maps resulting in long games.
Being different from the RTS trend that was going to rush-games with little maps and no buildings/resources EE in my opinion conquered a specific spot as RTS.
EE III lost this "old style" aspect going to uniform to the others fast-peace RTS with little maps, prolly presuming it was welecome as idea as the goal here is not playing 1 single map but conquering sectors in "risiko style", but the result imo lacks in fun, strategy, depth, under every point of view you could try to have to give a chance to this game.
Besdie the not so good first impact i got into the game a little, but i have to tell even if most of the new concepts were interesting as ideas, the game is no more then average under all the aspects, also the 3d engine, the graphics and animations were not shining surely, you can feel some kind of "bad insipration" for every game detail that you could notice.
Personally i dont see in this title anything really good, and also i dont consider it old tellin true, yes that can be relative, but Carrier command or Dungeon master are old, this one well...
for me this is a below average recent game, not an old good game.