I've found Ofsted reports to be a bit like sausages. Well-formed and tasty if you keep your eyes shut when consuming them. But as soon as you start to look at how they are put together - particularly the lips and arseholes that get thrown into their production - you quickly start to lose your appetite.
My kids have complex SEN. Fortunately, the SEN they have is one for which specialist teaching exists, and outcomes can be pretty good with the right support.
But Ofsted don't employ any of these specialist teachers as inspectors. So in terms of reliability, Ofsted reports tend to rank somewhere below the David Icke website for us. Once Ofsted start to send inspectors to my kids' schools who know something about this specific SEN - and once they send inspectors who are actually capable of communicating with the pupils - then I'll think again.
When I used to look at the reports, the first thing I did was check the professional background of the inspectors who produced the last report for the school I'm looking at. Ofsted publish some (limited) data - here
Most of the time, this data makes for depressing reading, even for mainstream school inspections. For example, the lead Ofsted inspector who assessed our local primary was someone who last taught psychology at a sixth form college. In the 1990s. You'll find inspectors assessing 1,500+ inner-city comprehensive schools whose last experience of headship was a village primary. Sometimes, they send the right people to the right school. But not always.
Also, the number of inspectors who play both sides of the street is depressing. A large number of inspectors also work freelance as education consultants, selling services to schools, academy trusts and LAs. One day, an individual like this can be inspecting a school for Ofsted. The next day, they can be telling a school how to make itself 'Ofsted-ready.' Somehow, Ofsted don't consider this conflict of interest to be a problem. There is a system of self-declaration of interest, but Ofsted won't say how often or carefully they pro-actively investigate.