Tbh, people's attitude mainly depends on whether you have older dc or not. My youngest child's Y4 class contains lots of little precious hot-house flower only or oldest children, who are endlessly comparing notes and fretting about every imaginable detail.
Meanwhile I have three older dc in secondary and have learnt long ago that unless your child is falling seriously behind in a way that they won't readily be able to catch up on, or unless they are so unhappy and frustrated that they can't participate in the class in any meaningful way, then really it will all come out in the wash.
Being on ORT level 8 when you're in Reception is fine if your child enjoys reading and you enjoy working wtih him. BUt it is not a predictor of straight A* at GCSE, an Oxbridge First and a partnership in a Magic Circle law firm by the age of 35. Conversely, being on ORT Stage 3 books when everyone else is reading the Magic Key fluently will not condemn your child to a lifetime as a crack-selling dropout.
It also doesn't matter that much if the teacher hasn't quite got a handle on your child's full potential. Your child's education will not be irretrievably damaged if he can actually read Roald Dahl at home but gets sent home with an intermediate-stage ORT reading book, or he knows all his tables and associated division facts, but homework consists of a sheet of 'Revise your 2x 5x and 10x table' questions.
Once you've been round the blocks of the education system a few times, the finer details of first time parents fretting about the levelling of reading books or whatever does tend to make you glaze over a bit. FWIW, GCSE is not a massively high hurdle, most children who are reasonably bright and at least averagely well-taught will be able to score a full house of reasonably top grades. Once you know that, you tend not to get so aerated about the minor details about what goes on further down the system.