I think the fact that Anthony Joshua's career is at stake makes the match even more interesting. This is a battle between a former UFC champion Ngannou and former unified world heavyweight champion, Joshua which makes it a great match for the challenge.
We should not insert Ngannou's as a former UFC champion as this is boxing. But he has proven himself that he can punch and box as if he was a pro-boxer because that's what we have seen in him against Fury.
I do agree though that Joshua's career is on the line here, if he still wanted to be relevant and go for the All British clash against Tyson Fury in the future. So he needs to win here and it will be good if he can win convincingly so that we can compare his win against Fury's performance against Ngannou. And let's say if he wins by knockout then he can talk trash against Fury and set up that big fight in London.