It’s important not to panic when a school gets a poor Ofsted report. By the same token, don’t get over-excited by an outstanding one either. Check the details, and talk with the school and other parents.
There are some serious flaws in Ofsted’s inspection process. Teaching unions have continually requested Ofsted carry out double-blind inspections (or at least double -blind samples) to see if their inspection process is valid. That is, carry out a second inspection on a different week, with none of the inspectors knowing how the others scored the school. Ofsted continue to resist this simplest of verification tests.
Hence you end up with some very arbitrary results, based largely on one person’s opinion.
Some factors are outside a school's control. Eg. Attendance is down to parents sending children to school, but low attendance stats will limit the final grade awarded.
Ofsted are constantly moving the goalposts, and have ever-changing fads and fashions about what is essential in a good/outstanding establishment. In the early years, it took the blink of an eye to move the emphasis from child-led learning and free play to adult-led instruction and 'school-readiness'. And while school-readiness sounds great, it involved such things as downgrading perfectly good childcare settings for allowing 2yo's to use sippy cups or giving children more than twenty minutes to enjoy a meal. In one case, a local nursery was downgraded from good to inadequate when one of its procedures concerning school runs was deemed to be a "serious safeguarding risk"; yet the previous had remarked that the exact same procedure was "best practice".
The flip side of this I shall that some schools can deliver a better inspection than others, without being better schools. So much of it is about presentation, and sweeping problems under the carpet. The previous head at our local school knew how to hide problems and coach staff to present a good image, resulting in outstanding Ofsted reports. The current one is addressing the resultant mess of unresolved issues do, because this means bringing those problems to light, had a bad inspection.
Certainly in the early years, there are whole books and training courses on how to present yourself best to gain outstanding grades. It’s largely a matter of style over content.