If your first impression of a stage is a single picture, what else are you supposed to base your very first thoughts on if not what it looks like? I saw a picture of a stage from a game I dislike, I was a little disappointed. I'm glad that Sakurai is repped older Paper Mario games that I like better as well. Everyone is happy, including both the people who liked Sticker Star and those that like TTYD.
Sticker Star, by virtue of adding in the Things as an important, well, thing, changed the overall aesthetic drastically. I mean, the stage has a giant fan in the background! In my eyes, it killed the Paper whimsy a bit, but I can see where people would like the dynamic.
I hope the Wii U version gets a Paper Mario stage, too, though it's probably not likely. It'd be cool to have an HD remade stage based on the original Paper Mario!