Well, I 'wholeheartedly' disagree with you.
There is nothing fun about the camera. A 3MP camera is pretty poor, but a .3MP camera is pointless. The pictures are grainy and just so pixelated that you might as well never use that one.
The SD slot is just as pointless. Wonderful, you can put music and pictures on it. Sony did that years ago. But that is besides the point.
The DSi, personally, will never replace my DS. It is a pointless upgrade and a waste of money, in my opinion. I never see the point in doing stupid upgrades.
I normally follow Sony, but even with the PSP-go, with its improved screen, lack of UMDs, faster loading time and more responsive times, it is still a pointless upgrade and a waste of money.
That is just my opinion.