I recently got a DS and tried these out today. The mario kart one is pretty cool. It's just Mario (you) vs like 12 shyguys. 1 course, have to look up the name again.

I'm not a big fan of DBZ, but I found this game to be pretty fun. It reminds me of Final Fantasy: Chrystal Chronicles for the DS. I don't know really what to compare it to seeing as i've never played the actual game. It was just one level of beating baddies up.