It's Great game! Mostly a clone to the previously mentioned game. It isn't a perfect game as it has some bugs, but gameplay is more brilliant and worth money spent for it. Graphics are improved, gameplay is similiar enough to older game to not get lost completely.. but adds a couple of new mechanics that's fun to discover and to masterize.
In the Stronghold franchise, graphics were not important but this time is really nice for an eye, yet it's still about economy, military, bastion architecting, and micromanagement. And all that can be found here! and Extra: Especially if you're fan of 'Far East' themes.
Highly recommended game!
PS: Not sure why it's so underrated...