Extremely addictive, if you like strategy games.
The Graphics aren't very updated compared to the GBA versions, but (as before) they do the job of telling you what is going on very well.
The Sound is much better than I expected, and fits what is happening on screen amazingly.
The gameplay is (aside from Combat mode) exactly the same as in AW2, aside from the new unis and COs. That isn't a problem personally, but I would recomend getting a cheap copy of a previous Advance Wars game before you shell out for DS, because I know quite a few people who hate Turn Based Strategy games. However, if you've played and enjoyed a previous AW game, AWDS is an essential game for the collection.
Around now, I'd mention Combat Mode, aside from the fact that almost all 200+ hours of my gametime have been spent in the War Room or on Campaign. Best to pretend the badly designed "ZOMG Realtime" mode doesn't exist.
In conclusion, AWDS is easily the most played game in my collection of DS games, and that isn't an insult directed towards Nintendo.
The only problem I can forsee with AWDS is it being marked as some form of super-addictive-digital-crack, and Tony Blair banning it's public use.
Hopefully, he'll be voted out before that happens.....