We've got some bad news for the 31 folks who listed SNK vs. Capcom: Card Fighters as their most-wanted game. Siliconera is reporting that the AI is hopeless in the card battler, and they're not the first to take the position that the game is inherently flawed (IGN said much the same last month). The issue? The computer only blindly attacks and blocks, ignoring the more sophisticated techniques such as healing cards in play, shuffling the deck, and counter attacks. In fact, once you learn the computer's simple strategy, it becomes increasingly easy to win within a single round.
The flaws with the AI beg (on hands and knees) the question of why so many games that are absolutely crying out for WiFi multiplayer don't include it. A game like this is made to play against others, and not everyone has the luxury of best-good-friends who come equipped with a DS.