Well, a lot of people loved the Colosseum and XD games which are all 3D.
This is just a new generation in that 3D style, which I am very excited for. I'll miss the old sprites, but to be honest, you could kinda see the awkwardness of the sprites in some of the 3D environments in Black 2 and White 2, especially during some of the cutscenes.
I'm hoping it'll make the battles faster and more dynamic. :)
My heart has wings and I can fly, I'll touch every star in the sky!