In the reviews it was reviewed very poorly because SNK produced glitchy DS game cards where you can't progress the game when you talk to a specific character at the 2nd play through which is required to get a 100% completion. SNK tried to inject some story sequences which are a tad boring but the core gameplay is true to its NeoGeo predecessor and the only real use of the touch screen is ripping booster packs open to get more cards in your collection, as a card game IIRC it plays similar to magic the gathering where the cards actions have to be payed by mana.
KDR,
I know you live in Germany but I do not know if the glitched cards are in the US only or worldwide. If you plan on importing an American copy heres a guide how to find out a glitched card vs a glitch free card. A glitch free card has a greyed out background on the game card sticker, a glitched card has a colorful background on the game card sticker.