So I recently got a subscription and was looking to through the Happy Hours I had missed and came across the one where they were first showing off the 3DS. Brad and Jeff warned that playing DS games on the 3DS isn't ideal because the DS games don't fill the 3DS screen fully (only about 2/3 of the screen space for top and bottom screens has the game on it), and then they demonstrated it on camera for proof.
Yet on my 3DS, DS games look great. They fill up both of the screens (apart from the widescreen aspect obviously) and have the same dimensions at a DS lite game would have.
Why is this? Did Brad and Jeff get faulty 3DSs? If you have a 3DS how do DS games show up for you? I think its a weird knock for the system to say that DS games won't look as good if its not true for all of the units. I played through all of Professor Layton and the Unwound Future on my 3DS and it looked great the whole time.