He's a fugazi in context of how he's billed.
In reality he's just a decent/good player that doesn't really excel at anything. He had a bit of a purple patch earlier last season, but plenty of bang average players have.
He doesn't create much, he's not necessarily a great passer, he doesn't dictate much, he doesn't really frighten defenders, not particularly quick or skillful, he's pretty basic in tight spaces etc etc
We know how Madrid fans are too, they've got their new toy in Mbappe, so Bellingham will be yesterday's news and they'll probably turn on him if he isn't brilliant.
Don't get me wrong, he's far from a bad player, he'll operate at a decent level for years but he's not this elite generational talent he's marketed to be. People will see it sooner or later.