Two years is awhile, but it depends on how much they pack into this thing. There are expansion packs that just add a couple of new levels, and there are expansion packs that feel like sequels.
I had a fun time with DS. I played through the singleplayer, tested the multiplayer and found it lacking, and deleted the game. Yet for a week, it was fun, and you can't ask for much more than that very often and get it.