I do miss the old sprites, especially from D/P and B/W. As some stated before me, the sprites were more vibrant in those games, while the 3D models seem very pale. I noticed this with some of my shinies, which disappointed me greatly. I think the 3D models would have looked better if they were as dark as the 3D models from Colosseum and XD. I could be remembering wrong, but I recall really liking the 3D models of the Pokemon from those games.