No the problem is the assumption in your post that Neville is amazing.The question is because everyone from NXT is doomed to bomb beause real people with real jobs won't like them. Neville is amazing, but is ugly and little kids won't like him. It seems important for a lot of people that a wrestler is able to move merchandise regardless of his work.
I like him. If I disliked him that's why I would dislike him.
People like marketable people because they like them, and that's what makes them marketable - being easily liked.
In short you have causation reversed.