The main value of this game is first unlocked with the Expansion packs Heir to the Throne, and the Divine Wind, which is what i will be giving a review of.
The game's graphics are average, nothing fancy here...
However, for replayability, it is almost impossible to run out of countries to play, from the Americas to Asia, and from Africa to Scandinavia. There are more than 250 countries to play as through history, from Napoleon's France, to the (I think Qing Dynasty??) In China. The map also has more than 300 provinces to capture and rule.
Story-wise: You make your own story, for your chosen country, say you're Norway, can you break free from the claws of Denmark and re-establish your former glory? Or Brandenburg, who is struggling with being part of a "Personal union" with Luxembourg. etc.
Aside from that, there's little events that pop up at random points during gameplay. This can be lots of things, from a meteor sighting (Those are nasty) to gaining a free advisor!
So if you fancy gameplay over graphics, then this is probably a game for you!