That's what these videos are for.
Nobody can be definitive about their judgments, but they can certainly say things like:
"Man, after watching that, I have some concern the overworld is going to be barren and rather boring to traverse, like Twilight Princess' world was."
Or
"Yeah I appreciate the size of the world and the horse's ability to gallop on its own, but it didn't seem like that was very much interesting to do in the snippets of gameplay they showed. After Wind Waker and Twilight Princess, I was hoping they'd learn how to make a more compelling overworld... early days yet, but the trailer did not alleviate those concerns."
I mean, that's what these things are for. Every trailer we get is one little blip on the radar for people to evaluate whether they want the product or not. It's fair game, and trust me if the Nintendo devs didn't want that they wouldn't have shown it yet. They are hoping this interests players.