[QUOTE=feilong80]I agree with everything except point 2. I don't think single card DS multiplayer is crappy at all. New Super Mario Bros, Tetris DS, and Metroid Prime: Hunters all provide solid single cart multi experiences, to name a few. You cannot expect the full on game; the DS has limited amounts of memory for which to even store the downloaded games.[/QUOTE]
Elite Beat Agents also has a good single cart multiplayer experience. And it's definitely nice to have. Considering that Osu Tatakae Ouendan did not, it was near impossible for a player in the US to play with someone else competitively.