Is it not acceptable to make factual statements about the ofsted report? If not, won't do that.
@Gobbolinothewitchscat Weeeeell it's a fine line. The panel has to "take into account the appellant’s reasons for expressing a preference for the school, including what that school can offer the child that the allocated or other schools cannot."
However, those points need to be very specific to the child and their own specific needs, rather than general education points. So you won't gain anything by showing Ofsted comments about, say, a poor level of education, under developed curriculum, lack of staff, etc; those are general issues and in reality, many children do have to go to such schools. This is really just an argument that says "X is a better school than Y", which won't get you anywhere - otherwise every child allocated school Y would have a case for appeal.
If there is a very specific comment about something that you can evidence is of especially importance to him and is something the appeal school can support - say he has a demonstrable interest and talent in languages, the appeal school offers 5 languages at GCSE and a strong tradition of language exchanges, and the offered school only one and is failing to support language teaching - that would be more relevant.