He’s had sporadic chances spread over the years. He wasn’t given 50+ test matches uninterrupted.
I agree this series should be his last chance and that he has underperformed. But to say he’s the worst is not even close to being correct objectively.
I am not saying he’s the worst. But he’s had plenty of chances and still is found wanting . I would still give him the next test as well and see how he goes otherwise the line should be drawn under him .