3ds games hover around 500mb to 1.5 gb or even up to 4gb now unlike ds games where some can be as little as 40mb for those 2d games.. remember the 3ds is essentially equivalent of the 6th gen consoles like ps2 and gamecube
i had a flashcard for my ds lite and with soo many games to download i cant bring myself to stick to one game and finish.....
xenoblade chronicles comes out this fri