I would like to follow up on the level of teaching and learning in schools and what it actually means. The current expected achievement for schools is to get a given per cent of levels at "satisfactory". We have noticed that to even get a "Good" in the current climate of OFSTED inspectiosn is pretty hard going. So much of it depends on outside factors too.
Also please take the level of quality judgements carefully. A "bad" teacher can get a "good" lesson under inspection - because they know what to do on the day, and will pull out all the stops, doing everything different for a week. Similar an "good" teacher can come out not so great - as this teacher may well be the one who just carries on as they normally do, following normal procedures, etc. and they may genuinely just have an off day.
To put it a bit in perspective, the school (secondary) which I work at is in special measures. One of the criteria for getting out of special measures is to achive 90% of all lessons at "satisfactory" or higher.
As a parent, I do check out OFSTED reports, but not on their own. A report must be VERY recent to be of much use. Also visit the school, look around, walk by at start and end of the day, and at break/lunch time, talk to parents, see the prospectus, etc.
Ask the school about the last OFSTED too. What measures are in place to correct the problems?
If the OFSTED is a year or two old, you may find that the school has done an awful lot of work to recitify such issues.