Blah
Not much to say here...if you liked Rise of Nations, you will like the sequel because not much has changed. If you are an RTS fan, this is about as standard as you can get.
Graphics: Upgraded graphics a little, added some new details here and there but nothing earth shattering.
Gameplay: For me at least, it seemed way to easy. Turtle for 10 minutes, build up and charge. I never really felt challenged and eventually found I could defeat any campaign by simply choosing a couple of specific groups for my army (wont give away for spoiler)
Unless you are desperate for an RTS, I would skip over this one and wait until you have $20 to blow, or are really bored.