Time for a quick review of this, not that I'm 'finished' or anything.
This is a fantastic game. Let me go through some of the decisions by the developers which have ensured that this is an enjoyable and accessible experience from the very get-go.
The obvious is of course present: Touch-screen is much-preferred to fondling around with buttons (though more on the use of those later). Two screens means you have the information needed visible at all times. Less of a given is how great the information is distributed. Context-sensitive information works wonderfully - you know what you need to know when you need to know it. Touch a building and you get the specs. If a building has an exclamation mark (or other symbol corresponding to other issues) and you tap it you'll see what's needed. It's a non-intrusive yet logical way of letting you know what's up in your city.
The touch-menu on the right of your bottom screen works great. Stuff like the mission book shows your goals - other options are logical like financial stuff where you can trade and a building menu and so forth. Again: logical and non-intrusive every step of the way. A question mark in your top left corner is another context-sensitive help. You're never lost in this game or its interface.
Its ease of use is just phenomenal. The game difficulty is adjustable of course, I'm talking about the intuitiveness and comfort of playing the game. The navigation is a dream; finally all the hype-talk about "this system works perfectly for strategy/*other pc genre* games!" comes to reality: Take a simple task such as scrolling around your playfield and selecting stuff. You drag the land like a map or 'flick it' fast and slow and watch as it zooms by. It's just so smoothly done: and never any hint of slowdown. The DS-buttons aren't needed, but they've even made it possible to assign hotkeys to them as you wish.
The game looks great too. Screens might not impress you, but it actually does. Everything is sharp, colorful and animates nicely - on the ds screens it looks as great as any strategy game has a right to.
The strategy gameplay is done wonderfully. The Anno (A.D) series is an acclaimed series, but this is _not_ a port of the 1701 PC game, it's a whole new game. It's made with a handheld in mind and hits just the sweet spot between depth and pick-up-and-play fun. Anyone can enjoy this, even if you've never played the series or any similar game before. It lulls you into the experience in the story mode with great and thorough tutorial-ish missions. You can choose easy, medium or hard difficulty if you're experienced. No one has any right to complain about the challenge presented.
Outside of the story (campaign) mode there's a "continuous" mode where you customize the settings of all aspects, including the opponents, yourself. Finally there's a multiplayer mode which I haven't tried yet. The _only_ thing missing in this game is an online multiplayer, that would be heaven.
Except for that, there's pretty much just one word fitting for this game: Perfect. It's a perfectly realized real-time strategy game for portables, for the DS. If you have any sympathy for strategy games AT ALL, pick it up. It's not "an impressive strategy game for a handheld", it's one of the best strategy games released on any system in the past few years. It would be a big shame if it never saw release in the states.