I picked this up at duty-free as something to amuse me for my plane journey because I love DBZ and bought it anyway despite the thought of playing a card game on a DS seemed a bit strange! Anyway, 15 hours of play later and I'm still less than 50% of the way through and I love it! There is a hell of a lot of talking, particularly in the beginning to explain the different types of card combos and how they all work both in battle and on the map. It is alot of talking but you need to read it or it can confuse you!
I find the game good fun, some of the dialogue is really quite funny particularly the ones between Vegeta and King Kai involving a joke book! I haven't tried multiplayer yet as I'm so engrossed in playing the story section, however the voice clips are all Japanese! So on the whole I think this game is good fun, quite predictable if you already know the story which most people who are playing will anyway, but it's worth getting :)