It isn't an endless runner. It has actual hand-crafted levels, like Rayman Jungle Run, which is much better than any endless runner I've ever played. With Nintendo's level designers, I expect it to be pretty fun.
I've noticed that both here and on reddit there's a vocal population that is really upset that this is being called an "infinite runner" because if the non-procedural and therefore not infinite nature.
It feels kind of like arguing about hacker and cracker.
The reason I brought it up is because Nintendo's level design is fantastic. I expect the levels to be varied and interesting, unlike most endless runners. My comment's parent was specifically talking about the novelty wearing off, and well-crafted levels don't rely entirely on novelty for fun.
I didn't mean to say that I disagreed with your conclusion about level design mattering a ton, I was just commenting on nomenclature and how it seems to be coming up with this. Most people seem to call Rayman Jungle Run an infinite runner too.
It feels kind of like arguing about hacker and cracker.